Can you buy or borrow a die? If so then cut a straight taper on the stub using the compound set at the angle of the threads. Use a die holder and push with the tail stock to get the die started square on the taper.
Threads might not need to be full depth. Just thinking out loud here.
or
check the nipples in the bin at your hardware store to see if you can find one straight enough.
Threads might not need to be full depth. Just thinking out loud here.
or
check the nipples in the bin at your hardware store to see if you can find one straight enough.
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