Quoted from Insane:I was thinking about doing this to my Joker Poker, for both the flippers and start button, but mine only have a small post that goes through a plate that would transmit the color, do i need to change the buttons? Is this something that can be done on a gottlieb? Forgive my stupidity...
Looks like older Gottliebs used clear buttons but had a metal backing plate. Pinball resource sells clear backing plates that will allow you to light up the button.
Clear Strap #GTB-A13898+ $0.94ea
http://www.pbresource.com/buttons.html