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Adam, Since the ZZ and my P/R are functionally so much alike I would probably be precluded from a device patent. My headstock may be different enough to patent by itself, and the wearing (STEEL) part is also easily replaced with an all steel master chain link. My P/R is quite rope specific...

As I understand it the zig-zag does not work SRT, only on a doubled rope. The hitchless pulley rack will work SRT, I think by virtue of the fact that the headstock is somewhat different and a bit longer, so that you have more of a mechanical advantage.