Bushing for lobe dome base and pingpong ball cutting tool mod.

It is just a small mod of "dome base". I am going to glue bushing to the dome base with acetone.

Updated 19.09.2015:
If you would like to spend a little bit filament, I added another mod of 40mm pingpong ball cutting tool. You need for it about 4 meters with 10% infill. As example, added OpenSCAD file too.