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@TM
tighten cog/lockring
one piece cranks have press fit cups, tried refitting them? or just strip out the bottom bracket, whack a load of grease in and tighten everything back up nicely?
Still reckon it's one of the first 3 though.
Any luck?
edit - or i think on some 1 piece cranks the chainring screws onto a thread on the inside of the crank arm, which could be loose. is it like that on yours?