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I cut a 1/2 UNF thread on the ball shaft, with the die opened a bit so the thread is a few thou oversize, and then tap a 1/2 UNF thread in the arm. I then screw the two together with some 263 Loctite thread locker. After this, I drill a 5/32 hole into the threads between the arm and the shaft and fit a 5/32 roll pin to mechanically prevent the stud undoing. No fear of a failed weld with this install. I have a few arms done this way from wrecks that my dad retrieved. They were used for a long time without failure that the replacement ball had also been worn to an egg shape. I have also replaced my shocker balls and front radius ball this way as well.