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@deleted
The other half of the axle.
Brilliant design, very high spec engineering if all the tolerances between BB shell width etc are correct, but essentially it's a fixed length axle and relies on a wavy washer to soak up any lateral movement.
If this lateral movement is too much I think this is where the click is created as the axle slides from side to side and deforms the washer. Tempted to get my BB tool in there and move the non drive side cup out a couple of turns to take up the slack and see if it makes any difference-it's never going to manage to totally unscrew itself anyway.