What I did was cut the threaded portion plus a little meat from a double wall nipple. After screwing the elbow in a coupling to assure it being straight, I cut the damaged threads off square in a band saw. then welded the new end to the elbow making sure it was square and the same length as before, useing another elbow as a guide. It also has messed up threads, both having been welded to a block.
There is not much left for threads in the block, unfortunately, and the repaired elbow slips in a ways before the threads catch. Same for a new nipple also.
I'll have to see about a tap to clean up what's left in the block I guess, if possible.
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