After trying un-successfully to find a good replacement torque ball, I took my original to my friend Gary who has a bunch of machine shop equipment set up in his shop. He was able to fix it for me with ease. He said he ground out the wear spot to a V, to ensure that he was down to clean metal, and to give the new metal some place to grab. Then he brazed it back in and chucked the piece up on a lathe, and turned it down nice and smooth all the way around. Came out awesome! Thanks Gary!