My son LOVES to ski, but by the time he gets out of school, we wouldn't have enough time to get to the mountain by the time the lifts close. So I built a rope tow in our back yard so we can rip laps until it gets too dark. In this video, I rebuild the drive system on it, which involved casting and turning a new urethane driver roller.
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I promise I'll still mostly make stuff out of rusty junk and not just buy shiny things with your money.