My fav tool i designed to thread close pipe nipples and pipe under 7" long using this type of block threading dies. My Reed/Craftsman block dies use a guide that rides on the pipe to keep the threading straight. The only prob is the length of pipe needed to thread by the time you get in the vise, thru the guide and thru the die you are about 7". This setup uses a pipe for the vise with a lathe turned coupler aka pipe guide for the threader. The little bushings go inside the guide couplings to keep the nipple you are threading from getting too tight in the coupler
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