Well, YankeePapa, I don't mean to sound "higher than mighty" but the Uberti reproduction open top revolvers have short arbors and your removal of material did not in any way correct anything. The wedge (by design ) was to be "driven in" (not finger tight!!) so as to "marry" the two assemblies. Yours would be an anomaly if what you say happened happened. I would submit that if you drove the wedge in further, you would lock up the cylinder, which would be evidence of a short arbor.
Mike