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@fizzy.bleach
God I hate installing bottom brackets.
Second hand external BB cups aren't going in particularly easy by hand. I can keep turning them with some hand force but when I unscrew there's tiny bits of swarf, like little metal fibres.
I emailed Spa and they told be I didn't need to chase and face the threads. Does this slightly "brute force" installation act as a kind of chasing? I wonder if the swarf is coming from the cups or the shell...