Hah don't be sorry! I absolutely knew the risks going in.
Can anyone guess the main thought on my mind right now? No need! I'll tell you!
"They sounded pretty fine before!"
I've taken apart and re-assembled plenty of electronics before, which is probably what led to my huge mistake. I wasn't expecting to actually be able to disassemble the driver, and I wasn't expecting that the driver had opposing magnets held together by screws.
Have you tried putting it back together? Did you have to remove the wires that connected to the diaphragm? You should be able to solder them back on.
Yeah, damaging the foil came from trying to put the driver back together.
I came at the problem from the inside of the driver, i.e. the ear side. I tried re-assembling from the ear side, which is how the damage was done, because it resulted in me trying to put the opposing magnets back together by hand. Don't do that. The chances of you being able to jam the two outside components of the driver together by hand are basically zero.
After ****ing it up a bunch of times, I thought of coming at the driver from the outside, i.e. the grill side. This is actually do-able. You can screw the ear-side of the driver/magnet assembly to the surface of the wood ring, and use the wood ring as a guide. The ring will guide the fragile inner foil component right in, and also guide the outside driver/magnet assembly in.
If I took off the grill as soon as the driver came apart I think there's a chance I could have reassembled it without damaging the foil.