Bowling ball plug and surface milling support

This is a attachment that you can use to make a bowling ball plug or surface milling machine from a cheap chinese dremel copy.

Updated on oct/23: I added the missing lowest base .stl that was missing from the original set. Now there is both 137mm and 160mm (outer diameter) versions. The bigger should be better to maneuver through those filled holes but I have been able to make every work needed with the smaller one.