K2000 body question

Hi,
I've got my trusty K2000 (still 99% functional after all these years[1]) and last night I put a new screen in it. In the process, I noticed that:a) I'm missing the bottom right corner body screw;b) the top right corner body screw seems to have pulled the ... (I don't know what to call it) thread casing through from the other side.
So that top right corner body screw definitely threads in, but it feels like it will ultimately just spin in place. The result is that I don't get a tight seal of the two body panels. I can flex the bottom away from the top enough that I can pass a nickel through into the inside (from above the "K2000" marking on the rear of the synth).
It works fine, but I'd feel better if this thing, you know, snapped shut, or solidly closed somehow. Seems that the screws are the only to really clamp the thing shut. So I'm wondering if:

option A) there's a way to push the casing back into the side it belongs and... plastic weld it so it can be a good anchor again?option B) there's a way to add some to the threading to provide enough resistance for it to effectively lock[2]?

I'm still considering upgrading to a K2vx or something if the wind is right, but so far this board[3] has been amazing since 1995 so I'm still fixing and using this board (the drive is the next thing to swap out).
Thanks for any help...
- David

[1] Aftertouch stopped working years ago and I've been too lazy to try and fix it.[2] When I was removing the audio board, I noticed that as part of either the original assembly or a repair in the past X years, someone put a small piece of plastic (looks like about 1 to 1.5 cm of small, clear zip-tie) into two of the threaded holes -- ostensibly this provides a more snug/reassuring fit for the audio board screws?[3] K2000 + Orchestral ROM + Sampling option/PRAM upgrade running 3.01J