could drill up from the bottom for a spyder rubber style detent. the frame would hold it in place and would only need two holes drilled. a cocker style could also be done by drilling one hole and using the ball bareing and spring from the underside of the body. my brother was having problems with double feeds and i told him to just pump faster. it have been several years since he played.
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CCM Works Sniper, Thumper, Kingman Hammer Low Pressure with Vertical ASA, TPX, Ion mech/closed bolt