Mower wheel replacement adapter

Mower universal wheel (from DIY store) replacement adapter.
For wheel hole diameter 12mm and M8x50 screw for tightening the wheel (as axis).

This thing contains 3 bushings:
external, internal and inside insert bushing to precise control
clearance.

I think that silicone or teflon grease (rather densy) is optimal to lubricate plastic elements and protect from dust and sand (that block and fast degrade wheel and axis)

I also prefer PLA because of its abrasion resistance.

Source files (FeeCAD) attached.