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@reeen
are we talking crank bolts with the op or chain ring bolts or bb, or whot? anyway, whot bolts are they, allen self extracters or the cheapo hex nut type? i'd say that given the bb axle is pretty solid steel it takes a real good yank of the crank bolts. so change your breakfest cereals in favour of a full british and tighten them bolts proper (get some 15 or 20cm long allen key) AFTER you checked for a centered chainring on your spider. if it wobbles too much is loosens the crank bolts and/or chainring bolts then clean the threads with some muckoff or spirit, put some grease on the threads and the bb axle and givit som'!
if it doesn't work ... get a new bike :P