It is true! when checking pistons and cylinders of an engine we do not know how we will find them. Good thing you found a new set.
At home I have seen pistons with super glued rings, but they are left in a bucket with diesel oil for several days until they loosen and are easy to remove, this is if you do not have ultrasound.
I congratulate you for finishing the job. I look forward to seeing the next job. Greetings and success 👋👋👋👋👋.
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Good tip about the diesel - thank you ! The ultrasound didn't loosen the top ring, so I'll give the diesel a try, and it should tell me whether the problem is burned on oil or galvanic corrosion.