142 Guy;
Big thanks to you for pointing out the inconsistency with science of this "fire and brimstone technique"...usually it's Derek or me! ...for frozen-in-place-pistons, the best technique is still, and will continue to be, to soak-in penetrating lubes for as long as you have time, and when you can't wait any longer, impact persuasion with a block of wood just as you describe...it rarely fails, and the risk for collateral damage is small!
Cheers
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