(tightening it as much as i physically could)
Well, there's where you went wrong. 40Nm is plenty for BB cups, if they rattle around in the threads after that you have a bigger problem which needs attention.
@gbj_tester started
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Well, there's where you went wrong. 40Nm is plenty for BB cups, if they rattle around in the threads after that you have a bigger problem which needs attention.