Note for note volume and note for note hammer hardness combined serves

As you would have guessed :
I'd love to see the interior

I have just this moment loaded up two .fxp's with the description 'mezzo hardness and volume note for note used as velocity note for note'

After adjusting hammer strike key depth, I found F4 to be kicking out a lower velocity than the any other note on the keyboard. It does nedd fine tuning globally, but F4 stuck out especially. That is why I've use it. I will post the Midi file so you can run it through the two .fxp's shortly.

I believe most Fatar keybeds have this issue...hence the Numa play mode that establishes a separate velocity curve for black/white keys. It does seem to work (at least on mine). Personally, I think it was a cheap engineering trick to avoid fixing the real problem (and possibly a huge class-action law suit).

There is also an issue with aftertouch while you're in there Chris.

I couldn't find anything better than the Numa keybed with the combination of the "You Play" feature. I did look at several software solutions that allowed me to define a separate filter between black and white keys and assign a velocity curve accordingly...it is not worth it IMO.

I used to tune/service my real piano, and they are no better.  It's the moving parts... they are always moving (and breaking)! You have the right idea though. I think we should be able to service our own keyboards more easily so we can fix/enhance them...I don't think you are wasting your time.

I have already been into my Numa to lubricate a sticking key, and I simply left the screws out because I knew I would be back in there eventually!

The Numa series has mono (or channel) aftertouch. I believe only the VAX77 has polyphonic aftertouch (in terms of new keyboards).

p.s. the top picture a few posts back confirms that the wood is sandwiched between the keys, a solid block, not a thin laminated strip each side of a plastic key.