I can't recall the actual design of an Autoprop but if their zincs are rare and/or ridiculously expensive, how hard would it be to simply machine them from zinc bar stock? (Which I am assuming exists!). I just rechecked my chemistry memories and not only does it melt at only 90C more than lead (so it could be cast into molds), it is malleable at just above the boiling point of water, meaning it could be hammered on a small anvil if both were put in a medium heat frying pan!
I have had occasion to hand-work some aluminum bar stock and so on for backing plates, brackets and the like, and it's easier than wood in some ways.
I wouldn't hesitate to make my own prop hub zincs if it came down to tapping a small cone or putting a hole through it for a cotter pin.
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