Thanks Jamie! Honestly... yes. I already mangled the nut on one actuator, and I had to buy another (though that was before I got the limit switches working). This one is *supposed* to withstand 1200N on it, and it has quite a large screw inside. I have plenty of spare gears, but honestly I think the nut will always go first. I have put a metal washer with a rubber ring on the top of the screw in an attempt to reduce damage, we'll see how that goes, but honestly I wish I could just have a metal nut. I'll look into that in future. For now, it moves a lot slower when attached to the bucket it'll be lifting, so hopefully that helps reduce wear from moving too fast.
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