Jay, the gauge that Brownell sells for about $100 is the "Manson Gauge". Dave Manson worked with Clymer Reamers and went out on his own and built the gauge that bears his name. The "hanging from the ceiling" method of using the Manson gauge is now old tech and quite inconvenient compared to a method that I was taught by our friend Jon Hosford. Jon realizes that not everyone is a potential customer for his wonderful tool and generously shared this information with me. If there is interest, I will explain it on the forum again as I have in the past.
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