Thanks, for posting the close up on your elevation mechanism, I have seen a lot worse welding jobs. It looks fine to me, but if you wanted a cleaner look, one could drill and tap the 3 flats on the 10 mm nut , then thread some rods to fit the 3 taped holes, you would probably have to chase the the nut with a 10 mm tap after you were done. Just another way to skin a cat. No offense C.W. Tracy