As I feared 1/4" acetal turns okay in the lathe, as long as only an inch or two is outside the jaws. (It fits through the spindle hole okay.) But as it gets closer to the required .1513", it gets too flexible. Fortunately, while hunting for a 10-32 die, I found a 5" long 10-32 screw. These are a zinc finish so I guess gun blackening will work on this. Then I just need some thumb nuts. McMaster Carr has nylon and black oxide ones in 10-32.
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