Thank you, Amarillo Mike. Amarillo Mike's demonstration is identical to what I went over in another thread without pictures. It eliminates the need for the Gaddy modification of the Manson tool. The Manson tool can be used as is, no modification, if you use Mike's method. Steven Dodd Hughes discounts the Manson tool as "worthless" because, as Daryl Hallquist states, SDH does not know how to use the Manson tool. The hanging method has been discovered to be obsolete, inaccurate, inconvenient et al. Oscar Gaddy did the best he could with what he knew, but his spring modification has been improved upon. The poster who disrespected Joe Wood's method, Nitro Express, is absolutely wrong. Joe Wood knows how to use a wall thickness gauge and he knows the Manson gauge is perfectly accurate, convenient, cheap, and his detractor is wrong. He is just too much of a gentleman to say it. Nitro Express could tell us which Galazan gauge he is referring to. The bench mounted gauge is very nice. I have used one for years. However, it costs five times what the Manson gauge does and is useless at a gun show. SDH mentions that he sees no use for a WTG at a gun show. That is not the experience most of us have. "At a gun show" or at a gun store is the main use of a WTG for most of us. Once the gun in question gets to our gun room, we have made the financial committment.