I think you did more damage than the old lady did, by forcing it as a way to free it. The cast iron piston rings were bonded to the aluminium bore, and by forcing it to turn you simply dug longitudinal grooves down the bore. If it isn't locked too badly you can often free it by gentle persuasion, but applying brute force to cast iron locked to aluminium is much the same as applying a cold chisel and hammer. Chances are it will now be an oil burner, and new rings wouldn't fix that.
