Saw a photo of one of these here
http://www.pinballrebel.com/game/pins/quick_draw/quick_draw_pinball.htm

AWESOME thanks for that!!   might not be so hard after all!
I hadn't looked inside the cab yet, the rest of the connector is probably inside.. if only i'd opened up the game for a look  
I just wheeled the 3 games on the trolley and stuck them in the corner.. didnt look inside any of them!
Only noticed the connector in QD because the backbox door was missing.