Ok I hope y’all had a lot of fun getting off on a tangent. The tool used to good effect along the sides of screw slots is called a multiple line graver and it makes fine parallel lines with a single stroke. Made in a variety of widths and line center-to-center spacings. I’ve had Geoff do that parallel line effect in his studio and also while he was set up at Hausmanns. Such screw heads can be seen on some Graded Fox guns but I never studied other makers to see how common it was on their guns.
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