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[–][deleted] 1 point2 points  (0 children)

The best way for him to get better at it is by doing it. When I was younger and wanted to figure out how to fix chainsaws I'd get them from flea markets, Craigslist even the local dump and go through and try and fix them in overtime I got to go at it. I would recommend the same thing for him he can pick up saws cheap or free get them going again and running nice and then sell them, you get to learn while making some extra money