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Old 06-25-2010, 08:51 AM
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The cylinder stop bolt rises and catches the notch. Back when they had skilled craftsmen assembling the revolvers they would adjust the bolts so that they timed properly and would cause minimal wear on the cylinder finish. But as years passed and cost cutting took over they didn't bother and the bolts simply ride over the cylinder in constant contact causing the wear pattern called a turn line.

Many of my revolvers from the 1950s have minimal turn lines, just a tiny dash leading into the bolt notch. On the other hand, my Model 25-2 made in 1980 has an actual groove worn in the surface of the cylinder from constant contact of the bolt.
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