I’ve decided to try baking the battery tube. I first removed any o-rings and hopefully any thread lube using isopropyl alcohol.
(Sorry for any crumbs, that is my kitchen counter.)
I placed the tube on my spare cookie sheet - it is in bad shape, and is normally a crumb tray under my toaster. I’ve used it for baking lights before. I also put down aluminum foil.
I placed it inside the cool oven, and set the oven to 550°F on convection mode, which was what worked for me in the past. I’ll update later when the oven reaches temperature. Depending how it turns out, I may regret it, or I may bake other pieces of it!