Atari 800 Space Bar not working

[Lardo Boffin]

My keyboard is back from being repaired and the space works nicely now! The whole keyboard was taken apart, the space bar fixed and all resoldered together. 
 

But another day another issue -  the H key is now starting to stick down. I popped the keycap off and looking at the plastic part that moves up and down both corners are cracked. I assume when pushed down it splays out and wedges in place? A couple of the other keys are starting to do the same now. Argh. 
 

Any suggestions?!?!? 

[Lardo Boffin]

I have put a little grease outside the white part that has split and although the key now feels different to the others it springs back happily into place! The others that were sticking have had the same treatment and are fine. 
Hopefully this is a reasonable long term solution. ?

[bloxomo]

I have one missing pin on pad 57 but couldn't get continuity with an inserted wire no matter how much I fiddled with it.

 

There seems to be a decent amount of room under the space bar.  Maybe I could stick a new switch under there, rig some sort of plunger to the underside of the space bar, and run wires from the new switch to the original pads?  If this sounds feasible, any suggestions on what kind of switch would work and fit?

[mimo]

A small momentary switch, non latched