Bumping past the junk postings.
I haven't taken one apart yet, but you might be surprised to find
microswitches in there already (they've been around a long time...
some games used them, but most didn't on account of cost). If not, as
long as you can physically fit one in there, there's no reason you
couldn't jerry-rig it up.
Try checking the manual for an exploded view of the stick... IIRC,
Mylstar/Gottlieb manuals are very detailed.
Good luck!
Rob
Is there an online location for the manual in question? (Mach3)
BTW I just added the ability to play driving games on my my Mame
cabinet too, check out the pics!
http://s206.photobucket.com/albums/bb45/amigoid/Thousand%20Dollar%20Joystick/