I can't tell him to use something that may well come apart. ....and it may
I'm gonna be a dissenter. It could have some hairline fractures you cannot see. That's how aluminum normally breaks. The what if factor would be too high for me. I would replace it. It's just a cast piston. They aren't very cheap. How expensive is another engine?
thanks Rusty you’re totally right, I’ll look for a replacement.