Spent whole day to replace a broken pipe and vault in my bathroom myself (yeah! saved some $$ for guns). Supposed to be simple, but I'm very inexperienced in this, so it took me hours. I noticed metal against metal screwing still has considerable amount of elasticity-- a tight screw can still be turned tighter when I applied bigger force.
If Luger barrel is same, that mark can help determine how tight is tight enough. Weird enough, the pipe maker never did this and all depends on my estimation.
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