I've tightened the nuts under the treadle as far as I can and tightened the plastic sawtooth inside near the pot. I got it used from a music store for super cheap, I'm sure they knew this was the problem with it. Otherwise it sounds fine, it just won't hold in one position, the pedal sinks when resting. Is there something that could be worn out that should be replaced? I've removed the circuit board to tighten the nuts from below, it seems like not matter how tight I make it it still doesn't support the weight of the treadle. Returning it is not an option, and it was so cheap that I'd just keep it for parts anyway, but I'd like to fix it.