Mower wheel replacement adapter
thingiverse
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.
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