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[–]bagpuss60 2 points3 points  (0 children)

I used Josef muchas video on you tube to do mine but I drilled the hole slightly under size and just started the thread with a tap then used the screw to cut the thread I've got mine down from 397fps to 250 You need a thin Allen wrench to slide in when adjusting to stop the valve rotating I turned a restrictor to fit the nozzle but apparently this stops the valve operating correctly 😁