Quote:
Originally Posted by Hydrocket
The ideal way is a threading machine. Barring that, a hobby lathe. Barring that, a portable threader. Barring that a ratchet threader.
Ratchet threader might be easiest and most cost effective. And will keep you from getting tired. You also might consider getting a high quality die. Possibly carbide. Also, use a threading fluid. It will make it easier and the dies will last longer.
Looks like this: 
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This is what I used back in the day... but don't know if it would work on 1/4" (1/2" gal. pipe was the smallest thing I ever did.
Have someone teach you have to use the lathe, it is a valuable skill! But have someone show you how to work it safely, they can be dangerous is you don't know what you are doing.