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"Gauge Pins" are solid steel cylindrically shaped plugs about 2" long available in sets with diameter variations of .001" each. They are used as Frank describes and work great. I use multiple pins and gradually work the bore up to proper size.
I have two (2) sets which cover diameters of 20, 16 and 12 GA bore diameters. I think I recall paying about $60 a set on ebay.
Bob Jurewicz
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