Hinge Pin Screw Head Indexing

[Old and Reliable]

[quote=Larry Frey;15894]See what happens when a pollock gets involved.[/

[Austin W Hogan]

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