Hollow Centered Thrust Bearing

I want to build a "visco fuse machine" and that requires a bearing with a hole in the middle. This bearing can be used to build a hub or similar.

The STL is sized to give a 20 mm center hole and roll on BBs (.177 caliber BB ammunition) but it's easy to adjust the size of the hole, bearing, and screws in the OpenSCAD source.

https://youtu.be/nn2E1u7awuo