diff --git a/src/mzscheme/gc2/newgc.c b/src/mzscheme/gc2/newgc.c
index c7ad9eee4f..00d5671dc8 100644
--- a/src/mzscheme/gc2/newgc.c
+++ b/src/mzscheme/gc2/newgc.c
@@ -1125,126 +1125,6 @@ inline static void reset_weak_finalizers(void)
 #undef is_marked
 #undef weak_box_resolve
 
-/*****************************************************************************/
-/* thread list                                                               */
-/*****************************************************************************/
-#ifdef NEWGC_BTC_ACCOUNT
-inline static int current_owner(Scheme_Custodian *c);
-
-struct gc_thread_info {
-  void *thread;
-  int owner;
-  struct gc_thread_info *next;
-};
-
-static Mark_Proc normal_thread_mark     = NULL;
-static Mark_Proc normal_custodian_mark  = NULL;
-static Mark_Proc normal_cust_box_mark   = NULL;
-static struct gc_thread_info *threads = NULL;
-
-
-inline static void register_new_thread(void *t, void *c)
-{
-  struct gc_thread_info *work;
-
-  work = (struct gc_thread_info *)malloc(sizeof(struct gc_thread_info));
-  if (!work) out_of_memory();
-  ((Scheme_Thread *)t)->gc_info = work;
-  work->owner = current_owner((Scheme_Custodian *)c);
-  work->thread = t;
-  work->next = threads;
-  threads = work;
-}
-
-inline static void register_thread(void *t, void *c)
-{
-  struct gc_thread_info *work;
-
-  work = ((Scheme_Thread *)t)->gc_info;
-  work->owner = current_owner((Scheme_Custodian *)c);
-}
-
-inline static void mark_threads(int owner)
-{
-  struct gc_thread_info *work;
-
-  for(work = threads; work; work = work->next)
-    if(work->owner == owner) {
-      if (((Scheme_Thread *)work->thread)->running) {
-        normal_thread_mark(work->thread);
-        if (work->thread == scheme_current_thread) {
-          GC_mark_variable_stack(GC_variable_stack, 0, get_stack_base(), NULL);
-        }
-      }
-    }
-}
-
-inline static void mark_cust_boxes(Scheme_Custodian *cur)
-{
-  Scheme_Object *pr, *prev = NULL, *next;
-  GC_Weak_Box *wb;
-
-  /* cust boxes is a list of weak boxes to cust boxes */
-
-  pr = cur->cust_boxes;
-  while (pr) {
-    wb = (GC_Weak_Box *)SCHEME_CAR(pr);
-    next = SCHEME_CDR(pr);
-    if (wb->val) {
-      normal_cust_box_mark(wb->val);
-      prev = pr;
-    } else {
-      if (prev)
-        SCHEME_CDR(prev) = next;
-      else
-        cur->cust_boxes = next;
-    }
-    pr = next;
-  }
-  cur->cust_boxes = NULL;
-}
-
-inline static void clean_up_thread_list(void)
-{
-  struct gc_thread_info *work = threads, *prev = NULL;
-
-  while(work) {
-    if(!find_page(work->thread) || marked(work->thread)) {
-      work->thread = GC_resolve(work->thread);
-      prev = work;
-      work = work->next;
-    } else {
-      struct gc_thread_info *next = work->next;
-
-      if(prev) prev->next = next;
-      if(!prev) threads = next;
-      free(work);
-      work = next;
-    }
-  }
-}
-
-inline static int thread_get_owner(void *p)
-{
-  return ((Scheme_Thread *)p)->gc_info->owner;
-}
-#endif
-
-#ifndef NEWGC_BTC_ACCOUNT
-# define register_thread(t,c) /* */
-# define register_new_thread(t,c) /* */
-# define clean_up_thread_list() /* */
-#endif
-
-void GC_register_thread(void *t, void *c)
-{
-  register_thread(t, c);
-}
-void GC_register_new_thread(void *t, void *c)
-{
-  register_new_thread(t, c);
-}
-
 /*****************************************************************************/
 /* Internal Stack Routines                                                   */
 /*****************************************************************************/
@@ -1348,6 +1228,80 @@ inline static void reset_pointer_stack(void)
   mark_stack->top = PPTR(mark_stack) + 4;
 }
 
+/*****************************************************************************/
+/* thread list                                                               */
+/*****************************************************************************/
+#ifdef NEWGC_BTC_ACCOUNT
+inline static int current_owner(Scheme_Custodian *c);
+
+struct gc_thread_info {
+  void *thread;
+  int owner;
+  struct gc_thread_info *next;
+};
+
+static struct gc_thread_info *threads = NULL;
+
+
+inline static void register_new_thread(void *t, void *c)
+{
+  struct gc_thread_info *work;
+
+  work = (struct gc_thread_info *)malloc(sizeof(struct gc_thread_info));
+  ((Scheme_Thread *)t)->gc_info = work;
+  work->owner = current_owner((Scheme_Custodian *)c);
+  work->thread = t;
+  work->next = threads;
+  threads = work;
+}
+
+inline static void register_thread(void *t, void *c)
+{
+  struct gc_thread_info *work;
+
+  work = ((Scheme_Thread *)t)->gc_info;
+  work->owner = current_owner((Scheme_Custodian *)c);
+}
+
+inline static void mark_threads(int owner)
+{
+  struct gc_thread_info *work;
+
+  for(work = threads; work; work = work->next)
+    if(work->owner == owner) {
+      if (((Scheme_Thread *)work->thread)->running) {
+        GC->normal_thread_mark(work->thread);
+        if (work->thread == scheme_current_thread) {
+          GC_mark_variable_stack(GC_variable_stack, 0, get_stack_base(), NULL);
+        }
+      }
+    }
+}
+
+inline static void clean_up_thread_list(void)
+{
+  struct gc_thread_info *work = threads, *prev = NULL;
+
+  while(work) {
+    if(!find_page(work->thread) || marked(work->thread)) {
+      work->thread = GC_resolve(work->thread);
+      prev = work;
+      work = work->next;
+    } else {
+      struct gc_thread_info *next = work->next;
+
+      if(prev) prev->next = next;
+      if(!prev) threads = next;
+      free(work);
+      work = next;
+    }
+  }
+}
+
+inline static int thread_get_owner(void *p)
+{
+  return ((Scheme_Thread *)p)->gc_info->owner;
+}
 #include "newgc_parts/blame_the_child.c"
 
 int GC_set_account_hook(int type, void *c1, unsigned long b, void *c2)
@@ -1355,6 +1309,23 @@ int GC_set_account_hook(int type, void *c1, unsigned long b, void *c2)
   set_account_hook(type, c1, c2, b);
 }
 
+#endif
+
+#ifndef NEWGC_BTC_ACCOUNT
+# define register_thread(t,c) /* */
+# define register_new_thread(t,c) /* */
+# define clean_up_thread_list() /* */
+#endif
+
+void GC_register_thread(void *t, void *c)
+{
+  register_thread(t, c);
+}
+void GC_register_new_thread(void *t, void *c)
+{
+  register_new_thread(t, c);
+}
+
 /*****************************************************************************/
 /* administration / initialization                                           */
 /*****************************************************************************/
diff --git a/src/mzscheme/gc2/newgc_internal.h b/src/mzscheme/gc2/newgc_internal.h
index 5a14cf32f6..f35f020a66 100644
--- a/src/mzscheme/gc2/newgc_internal.h
+++ b/src/mzscheme/gc2/newgc_internal.h
@@ -89,6 +89,11 @@ typedef struct NewGC {
   void *park[2];
   void *park_save[2];
 
+  /* blame the child saved off Mark_Proc pointers */
+  Mark_Proc normal_thread_mark;
+  Mark_Proc normal_custodian_mark;
+  Mark_Proc normal_cust_box_mark;
+
   mpage *release_pages;
   unsigned long stack_base;
   int dumping_avoid_collection; /* dumping coutner flag */
diff --git a/src/mzscheme/gc2/newgc_parts/blame_the_child.c b/src/mzscheme/gc2/newgc_parts/blame_the_child.c
index f75ae6d857..0b04a1a692 100644
--- a/src/mzscheme/gc2/newgc_parts/blame_the_child.c
+++ b/src/mzscheme/gc2/newgc_parts/blame_the_child.c
@@ -180,6 +180,31 @@ inline static void memory_account_mark(struct mpage *page, void *ptr)
   }
 }
 
+inline static void mark_cust_boxes(Scheme_Custodian *cur)
+{
+  Scheme_Object *pr, *prev = NULL, *next;
+  GC_Weak_Box *wb;
+
+  /* cust boxes is a list of weak boxes to cust boxes */
+
+  pr = cur->cust_boxes;
+  while (pr) {
+    wb = (GC_Weak_Box *)SCHEME_CAR(pr);
+    next = SCHEME_CDR(pr);
+    if (wb->val) {
+      GC->normal_cust_box_mark(wb->val);
+      prev = pr;
+    } else {
+      if (prev)
+        SCHEME_CDR(prev) = next;
+      else
+        cur->cust_boxes = next;
+    }
+    pr = next;
+  }
+  cur->cust_boxes = NULL;
+}
+
 int BTC_thread_mark(void *p)
 {
   return ((struct objhead *)(NUM(p) - WORD_SIZE))->size;
@@ -188,7 +213,7 @@ int BTC_thread_mark(void *p)
 int BTC_custodian_mark(void *p)
 {
   if(custodian_to_owner_set(p) == current_mark_owner)
-    return normal_custodian_mark(p);
+    return GC->normal_custodian_mark(p);
   else
     return ((struct objhead *)(NUM(p) - WORD_SIZE))->size;
 }
@@ -296,15 +321,16 @@ static void do_btc_accounting(void)
     GC->in_unsafe_allocation_mode = 1;
     GC->unsafe_allocation_abort = btc_overmem_abort;
     
-    if(!normal_thread_mark) {
-      normal_thread_mark = GC->mark_table[scheme_thread_type];
-      normal_custodian_mark = GC->mark_table[scheme_custodian_type];
-      normal_cust_box_mark = GC->mark_table[GC->cust_box_tag];
+    if(!GC->normal_thread_mark) {
+      GC->normal_thread_mark    = GC->mark_table[scheme_thread_type];
+      GC->normal_custodian_mark = GC->mark_table[scheme_custodian_type];
+      GC->normal_cust_box_mark  = GC->mark_table[GC->cust_box_tag];
     }
-    GC->mark_table[scheme_thread_type] = &BTC_thread_mark;
-    GC->mark_table[scheme_custodian_type] = &BTC_custodian_mark;
-    GC->mark_table[GC->ephemeron_tag] = btc_mark_ephemeron;
-    GC->mark_table[GC->cust_box_tag] = BTC_cust_box_mark;
+
+    GC->mark_table[scheme_thread_type]    = BTC_thread_mark;
+    GC->mark_table[scheme_custodian_type] = BTC_custodian_mark;
+    GC->mark_table[GC->ephemeron_tag]     = BTC_ephemeron_mark;
+    GC->mark_table[GC->cust_box_tag]      = BTC_cust_box_mark;
 
     /* clear the memory use numbers out */
     for(i = 1; i < owner_table_top; i++)
@@ -322,8 +348,7 @@ static void do_btc_accounting(void)
       int owner = custodian_to_owner_set(cur);
       
       current_mark_owner = owner;
-      GCDEBUG((DEBUGOUTF,"MARKING THREADS OF OWNER %i (CUST %p)\n",
-	       owner, cur));
+      GCDEBUG((DEBUGOUTF,"MARKING THREADS OF OWNER %i (CUST %p)\n", owner, cur));
       kill_propagation_loop = 0;
       mark_threads(owner);
       mark_cust_boxes(cur);
@@ -333,15 +358,17 @@ static void do_btc_accounting(void)
       box = cur->global_prev; cur = box ? SCHEME_PTR1_VAL(box) : NULL;
     }
   
-    GC->mark_table[scheme_thread_type] = normal_thread_mark;
-    GC->mark_table[scheme_custodian_type] = normal_custodian_mark;
-    GC->mark_table[GC->ephemeron_tag] = mark_ephemeron;
-    GC->mark_table[GC->cust_box_tag] = normal_cust_box_mark;
+    GC->mark_table[scheme_thread_type]    = GC->normal_thread_mark;
+    GC->mark_table[scheme_custodian_type] = GC->normal_custodian_mark;
+    GC->mark_table[GC->ephemeron_tag]     = mark_ephemeron;
+    GC->mark_table[GC->cust_box_tag]      = GC->normal_cust_box_mark;
+
     GC->in_unsafe_allocation_mode = 0;
     doing_memory_accounting = 0;
     old_btc_mark = new_btc_mark;
     new_btc_mark = !new_btc_mark;
   }
+
   clear_stack_pages();
 }
 
diff --git a/src/mzscheme/gc2/weak.c b/src/mzscheme/gc2/weak.c
index 8c2299d8aa..e146a8646a 100644
--- a/src/mzscheme/gc2/weak.c
+++ b/src/mzscheme/gc2/weak.c
@@ -9,7 +9,7 @@
       init_weak_boxes zero_weak_boxes
       GC_malloc_ephemeron
       size_ephemeron, mark_ephemeron, fixup_ephemeron
-      btc_mark_ephemeron [ifdef NEW_BTC_ACCOUNT]
+      BTC_ephemeron_mark [ifdef NEW_BTC_ACCOUNT]
       init_ephemerons mark_ready_ephemerons zero_remaining_ephemerons
       num_last_seen_ephemerons
    Requires:
@@ -235,7 +235,7 @@ static int mark_ephemeron(void *p)
 }
 
 #ifdef NEWGC_BTC_ACCOUNT
-static int btc_mark_ephemeron(void *p)
+static int BTC_ephemeron_mark(void *p)
 {
   GC_Ephemeron *eph = (GC_Ephemeron *)p;