This happens occasionally:
Repairing it with a length of 20 mil = 0.5 mm music wire didn’t take long:
What did take a while was removing one of the screws, turning off another millimeter of thread, and sticking it back in again. The new wire is slightly thinner, stacks up just slightly less under the screw head (maybe I used two turns instead of three?), and let the thread stick into the Delrin bushing I put inside the aluminum roller.
Imagine the middle screw with a slightly longer smooth end and you’ve got the idea:
That was easy …
It’s worth noting the JB Weld epoxy coating remains in as-applied condition after well over a year.