I'd just to thank everybody who took part in this helpful thread.
I am a sound engineer who was looking for something to use in the studio while the lights are off.
As a result I ordered a NightHawk (20% off memorial sale) x8 as well as the O-Rings from Mc Master (2418T114 Soft Buna-N O-Ring AS568A Dash Number 008, packs of 125).
Hopefully this mod will make the keyboard feel more like the KeyTronic that I've been using for the last 10yrs...
I love that thing & was hoping I could find an illuminated version of it, but hopefully the NightHawk x8 will be even better!