Cast Is A B*#CH!
I wonder what the filler was. It ground easily, didn’t clog the stone, and no sparks at all. Throughout the process of grinding I could see tiny cracks in the cast oosing a dark liquid. Water or oil I don’t know.
Ground it, it fit, it worked well, then it broke! The original weldor had only welded the outer shell of the break.
Repair was extensive, I failed to take pictures. It involved cutting away enough material to get to center with 308L filler.
Welding went well with plenty of preheat. As it cooled slowly I could hear crackling sound.
So far it is holding. If it breaks again, I’ll replace it with steel.