diff --git a/.coverage b/.coverage
index b9068da..2d312f0 100644
Binary files a/.coverage and b/.coverage differ
diff --git a/cadquery/CQ.py b/cadquery/CQ.py
index 0ecac23..92449cd 100644
--- a/cadquery/CQ.py
+++ b/cadquery/CQ.py
@@ -684,7 +684,8 @@ class CQ(object):
         endVec = Vector(axisEndPoint)
 
         def _rot(obj):
-            startPt = obj.Center()
+            # TODO: compute the weighted average instead of using the first solid
+            startPt = obj.Solids()[0].Center()
             endPt = startPt + endVec
             return obj.rotate(startPt, endPt, angleDegrees)
 
diff --git a/cadquery/freecad_impl/shapes.py b/cadquery/freecad_impl/shapes.py
index 1d0336f..d35a992 100644
--- a/cadquery/freecad_impl/shapes.py
+++ b/cadquery/freecad_impl/shapes.py
@@ -185,10 +185,7 @@ class Shape(object):
         return BoundBox(self.wrapped.BoundBox)
 
     def Center(self):
-        try:
-            return Vector(self.wrapped.CenterOfMass)
-        except:
-            pass
+        return Vector(self.wrapped.CenterOfMass)
 
     def Closed(self):
         return self.wrapped.Closed