Have you watched the YouTube channel Project Farm? The guy does test with everything from epoxies and breaking strength to how long different drill bits last to do all kinds of weird things with lawn mowers. He even heated up bacon grease and filled the crankcase full to see what would happen. They do actually run on bacon grease.My lawn mower broke.... and unlike your precision milled carpet roller, I fixed it like a redneck
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They wanted 80 dollars for the pull assembly...pffft
Now it is an electric start
That's the only way he starts a lawn mower. Neat idea. My super precision roller was actually, pretty low tech. Looks high tech because it's shiny.
Spray paint your drill with chrome paint and make it precision.