Here are some pics from Thursday. This Murray/ Home Depot brand panel was installed 3 years ago when the homeowner remodeled the kitchen. I could not move any of the 3 main lugs with my allen wrench, even the burned one. After de-energizing, I put my hand on the burned lug and it snapped right off. Obviously, an installer error of over tightening but I can't believe how chintsy those 2 screws are that hold the lug to the main bus.
I checked at home depot and I see that the new Murray design on those lugs has changed to something that looks more sturdy.