So, on average, you get about a half-dozen uses out of them before they go?
What is is that wears out on them? Is it the metal ridge around the case or is it the metal cap that gets loose?
I wonder if it is that gap in the body where it joins up with the metal end cap that wears and gets bent.
I suppose it's futile to try to unbend them or to fix them once they go.
Could you handle them more carefully?
My teacher in high school used to bulk roll film for us students. I know he reused cartridges dozens of times before they wore out. And that is with high school kids handling them.
(See in my post above in reference to losing a roll of film... )
Were the metal ones made 25 years ago just built better?