Gregg, that piston sure looks like junk to me. I have no idea WTF is going on with this guy Naked Arborist nor do I know where he got his degree in metallurgy or all the equipment he has to do a complet PMI on his pistons to proclaim that his piston that was damaged by a foreign object to be junk.
What ever, he was looking for a piston, I pointed out where to get one, now he aint happy? I guess you just cant help some people so I guess I'm done with it.
Interesting that he refers to knurling on the piston. As far as I know knurling pistons is a last ditch to save a piston skirt rather than replacing the piston. Kind of something you do to tighten up a dog engine before it's sold. You can also biuld them up with chrome plating which is much more desirable.
If you do have a piston that you want to sell because it's scored up, just turn it down, recut the ring grooves (forget the pins) and knurl it. You now have a customer.