I think the main reason why the pin in mine broke is due to the extreme amount of pea gravel and other various small rocks, on my HL KT I've had rocks wedge themselves into just about every part of that tank, I've even had them in the idler wheel before. But I'm going to see if I can find some piano wire or something like it as Rich suggested to try and fix it. And if that doesn't work then I'll ask around here for some spares. But I am quite happy to know that the people here are friendly and helpful, always a good thing in a hobby with as much tinkering as this one.