That's one hellova interesting post, OF! Thanks for that. Not sure about the "dope,"just that there was some discoloraton to that area and I assumed some added material. So perhaps some of these units have welding weakness issues.
It can happen when you fail at adjusting the ring to fit better.
Maybe pressing too much on the battery, depends on how much will the wood behind prevent it from bending. On my first LB, the lft rail teared off. At the side of the battery connection/positive rail. IDK it it was from hard battery pressing or the q-tip misuse or manufacturing defect that "seeded" the tear.
The weak weld must be it. Q-tips tearing the steel would leave a jagged bunch of individually pulled wires. I have an incision-like slice.
Who knows. I'll let Magic Flight figure it out. Elegant design, but clearly this screen is delicate.
I sure appreciate your help
Vito! What a fun fellow