Bill wrote:Since wax and string are both thermal insulators, I don't see them shrinking much in cold conditions.
I promise to never put your pipes, or any aspect of them in the fridge or freezer.
Have you ever put beeswax in the fridge? The effect is brittle beeswax. If it is beeswax that coats the threading, the "grip" is shattered, and thus the cap comes free. Wood will also shrink with lack of humidity, and that occurs in the fridge.
I have beaten my argument enough, sorry, I'll leave it alone now.