Grant Erwin wrote:
OK, this morning I welded it, and yes, the allthread was tight but it
came right out with Vise-Grips and then I was indeed able to chase the
threads with a tap (they only bound right around the weld area, as
though they'd somehow shrunk right there) and then the threaded piece
moves smoothly throughout. Cool. I wound up doing something different
than I'd said. I faced off the coupler nut and installed it on the
allthread in place, but not jammed. There was actually a very small
range of radial location where the allthread didn't rock slightly, and
the threads didn't bind at all. I welded it right there without
clamping, then like I said, chased the threads. Bingo. - GWE


I made up a door clamp in a shop once . Two lengths of 1" all thread
running parallel through welded coupler nuts . It did bind a tad . Used
a three corner file on the threads to get just enough clearance to move
smoothly . It is still in use and has been in daily operation for over
25 years now .
Ken Cutt