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Soak it down with Kroil or PB Blaster?
Here’s one of my attempts, that pipe clamp was straight when I started, there is a 16 mm socket on the Nut on the threaded end and a larger socket over the head on the bottom end, I straightened out the pipe and reversed the pipe clamp pulling from the other end instead of pushing with the same result. Maybe higher grade pipe might have helped. That’s when I decided to go to the grinder.
Pete thanks for the input. Before I took the grinder cutting wheel to it, I heated the threaded end to orange hot. I tried heat gun to the bolt head side which got it to hot to touch. At the machinist , I’m sure the head got hot, because they had to weld the Nut on the head 2 times to get it out. Would the heat of welding be enough to compromise it. The machinist tried heat before resorting to welding the Nut on, I’m not sure how hot he got it. The casing holes although corroded appear unmarked or altered from original to my eyes. I did consider getting a used one as you suggest, and still thinking about it. Also looking into a magnaflux process that looks for imperfections, at a locale aluminum extrusion factory here in town. But if costs more than a $65. eBay replacement might be cheaper. I’m considering my comfort level with this whole process.