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Some folks weld material to the end of the arbor, some drill and tap the arbor so they can screw in a set screw (not good), some will stack washers/shims. I like the idea of a single full size spacer that is mounted in the arbor hole. That allows the end of the arbor to fully contact a solid "connector" in the barrel assembly and under tension (from the wedge being properly "driven" in) so the two assemblies will respond as a single unit each time the revolver is fired. It is the length of the arbor that determines the barrel /cylinder clearance of the assembled revolver. I like a .0025"- .003" clearance on cap guns, .002" for cartridge guns.
Mike
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