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hey, what's the purpose of the track?
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I believe they used the tank tread as chain, instead of using the actual chain and sprocket kit. I haven't done any testing, but I would bet that the tank tread is at least twice as strong as the chain. With an arm that size, it seems like a pretty good idea!
Just for future thought, it is perfectly legal to actually cut the "pads" of the tank tread off, and use the links themselves as chain. But, at $30 for the kit, I understand why you wouldn't want to do that!
BEN