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The previous fractures lead me to believe that the rod was badly bent at some point in the past, then straightened, sort of, cold. That damage, plus the flexing since then have made the rod brittle. Welding would repair it for a while. Any flexing would cause it to break again. Other than replacing it entirely, replacing the majority of it- the center section-- and welding that to the existing ends, are about the only good choices available. Long sections of the same diameter will last longer as having part of it larger simply means that the majority of the flexing will occur in the shorter smaller sections and they will become brittle sooner.
I went to the steel center and purchased a piece of 7/8 and had it threaded on the end. I asked for dimensions on the board, and from that made my own link for around $30 if I remember right. My own design on the front loop and a couple of bends with the help of a press, and works great. (cold rolled I think) FWIW
I knew they were different, most every part is different on a Lo Boy's Fast Hitch. I was surprised they were the same length, but a Lo Boy hangs a lot further back than a Cub, so guess it makes sense after all.
A bit of chain and I got the harrow home. Left the cobblestones behind
1971 Cub (Rufus) 1950 Cub (Cathy) 1965 Lo Boy Fast Hitch (Nameless III) 1970 Cub 1000 Loader & Fast Hitch (Lee)