Screw Threads
The screw nut and bolt business was a major division of the Parker companies. They made custom threaded fasteners for many other manufacturers.
Most of the screws inside Parker locks and frames are 40 tpi; what we now call a micrometer thread.
Returning to the initial question; it may be possible to distort a Parker frame by adjusting the head of the screw, as the threads are continuous through three mating parts.
Best, Austin
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