This is the worst crank in the world and comes loose all the time. I worked with FSA a ton back when these were popular, and so became intimately familiar with their prescribed fix:
Remove the crank arm and preload cap, clean both the spindle interface and the cap very thoroughly, removing all grease and other residue. Apply green (void filling) thread locker to the male spindle interface, and blue thread locker to the preload cap. Install everything to spec (which is something ridiculous like 1.2 nm, IIRC), and allow a minimum of 24 hours of cure time.
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This is the worst crank in the world and comes loose all the time. I worked with FSA a ton back when these were popular, and so became intimately familiar with their prescribed fix:
Remove the crank arm and preload cap, clean both the spindle interface and the cap very thoroughly, removing all grease and other residue. Apply green (void filling) thread locker to the male spindle interface, and blue thread locker to the preload cap. Install everything to spec (which is something ridiculous like 1.2 nm, IIRC), and allow a minimum of 24 hours of cure time.