Your too short arbor is allowing the wedge to work loose. You should'nt be able to lock up the cylinder by pushing (or tapping ) the wedge in. This points to the arbor not fitting. Since its a conversion, the wedge may not have a spring and the screw has a flat side for easy wedge removal, other wise, it's to keep it from comming out. I like a barrel /cyl gap of about .0025 - .004. Too big of a gap will cause too much crap to foul up the arbor/cyl clearance and bind up.
45 Dragoon
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