If you search "manson" on this forum, you will get two threads with my name on them. There are two opinions on how to use this gauge, but one of the threads has an illustration posted by the Reverend Doctor Drew that will explain. Jon Hosford, the guru of wall thickness gauges, taught me the horizontal method and our own Brian Dudley also recommends the horizontal method. My original tutorial may be on the doublegunshop site.
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