Yea, I didnt think the WD40 would make any difference, not at 20 tons and not moving! My fear with heating is that the hardy will expend enough to bust the tail off. I know wrought is much together than cast in this regard, but its still a cause for concern.
When I go back to it, I will try giving the hardy a few taps with the hammer while its under pressure. If that doesn't break it loose, its drill time, which will piss me off, because that will ruin what I had hoped to be a good (and useful) tool.