So.... I had an epiphany a few minutes ago. Since searching for a replacement "rubber plunger" or "rubber dome" has been pretty much an exercise in futility and I really do not wish to gut a working keyboard just for a few parts, I tried to think of an alternative. I considered some type of coil or spring (such as in a ball point pen) but since I didn't have anything workable available, that idea had to be canned.

I ended up cutting a few pieces of foam into the correct shape, placed these under the space bar, popped the bar back in, and voila, it is working! This may not be an elegant solution but it seems to work just fine I'll probably see if I can find one or two springs to try replacing the foam with, but like I said, the foam is doing the trick for now, yay! :lol: