As I recall it the bolt #25 threads through the cast door arm and lets you set the height of the door. The nut #29 is on a smaller diameter section of bolt #25 such that when the height is adjusted right that nut is tightened down to clamp onto the sheet metal and hold that bolt tight, then the hinge rotates on the larger threaded section of the bolt. The hole in the sheet metal is supposed to be a close fit around the bolt, and should not be oval. The hinge is supposed to rotate on the large threaded bolt, and the bolt is supposed to be very tight in the sheet metal hole and not move at all.
That's how I think it's supposed to work, anyway. If the words used to describe the parts in this reply offend anyone, suck it up, I could care less.
hmm from what you said it makes me wonder if bolt #25 is loose and has dropped down some and the smaller section has fallen below the sheet metal hole and since it is smaller then hole is why it looks like it is wallowed out or ovaled..
time to get the flash light out tonight