Hawg is right again (I'm slippin Hawgie!!) !! He's right in that all Uberti's have a short arbor. This essentially means that in order to have the same revolver each time you assemble it (after cleaning or such), the arbor needs to dead end into the arbor hole. That is how they were designed to function and that is also what determines the barrel/cyl clearance (no matter how far you drive the wedge in). The wedge isn't a "gap setting" instrument, its job is to hold two assemblies together under tension.
I accomplish this by shimming up the hole to meet the arbor. The shims are held in place with " metal impregnated epoxy " and I set the bbl/cyl clearance to .0025" on cap guns.
Setting them up correctly makes them shoot and act as a solid frame revolver. It's amazing what kind of accuracy these revolvers will produce!!
(Thanks Hawg!!)
Mike
www.goonsgunworks.com
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