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Re: bolting square aluminum without crushing walls
we've been using that style of frame for years and i have cranked down on the bearing journals VERY hard, i don't think we've ever crushed a bar from over tighteneing the screws. and i'll add we always use semi-thick hardened washers on 1/4 bolts for the drivetrain stuff. so i guess my advice would have to be get some good washers and you should be allset.
good luck!
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