Just realized that the Flipper Fair I have been working on is missing the 10 point bell assembly. I am assuming I need a 3" bell assembly GTB-B8671A, shown here http://www.pbresource.com/bells.html? Does anyone have a photo of the inside of their backbox? A picture would be nice to confirm. You can see from my picture the screw holes where I think the assemble is supposed to me mounted.