I have metal deckfills for both the water
tank and the waste tank. If these are not used for a long time, they become stuck to their housing and impossible to unscrew. The top of the deckfill accepts a winch
handle and even with that I cannot budge it. I've already replaced the entire housing once but I'd prefer not do that again. Is there any other way to unfreeze it? I tried liquid wrench to no avail. I have a gas torch for soldering, would that help, if I say heated the deck
fill and then threw some water
on it to cool it? Or would the heat cause permanent damage to the fiberglass
around the housing?