I just bought a used PB 3400, and would like to figure out some cheap "fix" to quiet the spacebar. It is a bit loose, although in perfect working condition. It just seems like I need to tighten it a bit. Or maybe stick something underneath it to muffle the tinny sound it makes when I strike it.
I don't want to buy a whole new keyboard for it... It doesn't need it. I just need it to be a little quieter so I won't bother the people working around me.