I am looking for a way to fix the center, and only the center, of a circular edge or face.
Imagine a vertical cylinder that has to have a flexible radius and flexible height, but does need to have a fixed location. If you fix the bottom face, you only fix the Z-location of that face. Fixing the cylindrical face locks the XY position of the cylinder, but also its radius. Fixing the circular edge of the bottom face leads to a combination of these two results.
The only solution I can come up with is adding a dummy solid with a concentric constraint. But I would prefer to not have to use dummy solids. Is there another way to do this?