This tool is basically a telescoping device for transferring an inside dimension to a ruler or for setting up a stop block. The gauge is made from two nested sections of anodized aluminum angle held together with a small spring clamp. I have found the most practical size of angle is 3/4 in. by 1/2 in. (outside dimensions). Make sure you get the kind of angle with square inside corners rather than the kind with rounded inside corners. If you can’t find a small spring clamp, a binder clip from a stationery store will work fine. Drawing: Jim Richey
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