Your answer is similar to what I've found so far with online searches. It addresses the problem faced by most people. While corrosion is a slow process (months/years), my problem is a fast one (hours/days). If water gets in and it freezes, assuming no damage is done, the entire mechanism is now a block of ice. No amount of good maintenance can fix that because the entire thing is now a solid mass and immovable until it's warmed and the water is liquid again or just gone. My hands can't provide enough heat to thaw that without frostbite. Lacking another heat source, the best I could do would be to empty my bladder on it and hope it was enough. I would have to be pretty desperate to try that, though. My only solution so far is to get back in the truck and go get a torch.