I have several aluminum tanks where the threads are so worn out that the fitting won’t tighten up. I use J B weld. I position the fitting where it needs to be and let it sit overnight. They can be and I have removed them. The J B Weld can be removed with a heat gun. Get it hot and it turns soft .
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
