Hi,
I have a Gottlieb System 1 and it's missing one of the metal pieces that the locking mechanism goes into when you turn the key. There are two of them on the section that supports the backglass...one of mine is bent and won't lock and the other is missing so if you have one or two to sell that would really help me out. At the moment I have a rolled up cloth wedged underneath so it stops opening while I'm playing!