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Deadlywind Since the back part of the FiburX and FiburX8 can be detached (to change to a different barrel thread), the holes are for placing a metal rod like an Allen wrench through two of them to get more torque on tightening/loosening the joint thread (which is LEFT hand threaded btw!).

Deadlywind Yes! We were one of the first to adopt using "quick" AC threads.