sounds better - migth be just me who was confused 
my A2000 keyb has rubber cups. The break was the caps breaking in two... top part + a small part staying stuck in the stems. The gluing problem I had/have is to get the caps back on without messing up the cups or any other bits (I have big fingers... so slightly clumsy)
Yep, as you noticed, using glue to repair these is an excercise in futility.. No amount of finger dexterity will help here. :-)
If you end up having to remove a keycap and want to be able to attach it again, it must be pulled directly upwards from the keyboard.. No twisting, no bending. The plastic stem in the middle can't handle much abuse.
Reassembly is just fitting the rubber cup or metal spring to the keyboard base and snapping the keycap back into the white or black stem that's in the keyboard mechanism.
I seem to remember a few years ago I looked into this and there are text files on Aminet or elsewhere explaining the differences you need to take into account with the connectors.
Best forget electricity and focus on swapping the black plastic that holds the mechanism instead.
One thing I didn't mention before is, that the keyboards must both have the same shape return key and left shift. Else the contacts won't line up.
I've removed broken key stems before by drilling into the centre of the stem (no more than 2 mm) with a fine drill bit, 1mm, in a low speed rechargable drill, and then screwing a fine screw into the hole.
Or just take a small jeweller's screwdriver (phillips head), insert it from beneath and push the piece of plastic out.
Naturally you need to dismantle the keyboard for this, but in my experience, this is much less frustration in the long run.
