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  • what is your crank and bb combo? perhaps you're mixing JIS and ISO and so the cranks aren't sitting very tight on the spindle.

    This is a valid point, the tapers are different angles, so a mismatched combo could cause the taper to "rock" (and eventually loosen) when fully wound up.

    Check that your crank arms are still "square" tapers (not slightly round) and if not try and match tapers when replacing.

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