Not sure what your capabilities are, but buy a 1.500" ball from McMaster Carr (
https://www.mcmaster.com/9528K64/ ) and drill a 37/64th hole thru the ball. Then tap the hole to ⅝-24. I set the wishbone onto the front of my mill and machined the ball & stem down to 0.625" where I can thread the stem. Then thread the ball onto the stem and use threadlocker to keep the ball from moving. I am still working out the procedures on this operation but this does a clean repair that will last for another century at least.