At about silly o’clock I decide to have another look at the clock. I found that importing Stl. files into Blender has limitations. Stl. files are triangulated and not quads. they even have NGONS what they oughtened to do. See this is one of the very end of thirty teeth. Okay I removed double vertices but Shirley she can’t be responsible. Should remove this but not for thirty teeth. Can’t be arsed, let Shirley do it.It causes a massive problem for rigid body physics. If I generate a perfect gear profile which this tooth is then moving the vertex down to triangulate the mesh doesn’t solve the pr