When tuning those guns I 1) reshape the cylinder bolt (cylinder stop) so it is not sharp and is angled properly, 2) reduce the spring tension or replace the spring with a lighter one, and 3) retime the bolt to drop into the leade (the V shaped cut ahead of the cylinder notch). Basically it is cosmetic. The condition is self-correcting, as the compression eventually stops the "ding" and the bolt can only come up so far. No, it won't cut through the cylinder and blow up the gun!
Jim
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