Have a SVT-40 with a gas piston that does not want to come off. Yes I have a Sovieticon-era wrench for it, but I am hesitant to apply too much torque lest the head of the piston snap off like an old bolt. There have been extended periods of kroil, but so far no luck. I am hesitant to shoot it because this is a non-rebuilt gun with an early stock with the thin wrist that has already had cracks repaired. I can leave it as-is if it comes to that but would prefer to get the piston loose so as to properly clean that area of the gas system and leave the gun a little better off for whomever owns it after me.

Suggestions appreciated, even though I'm guessing there is no magic bullet for this one.
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