Zitt on "In Stock: Custom Bally Flipper Button Mod"
Saturday 25 November 2017 at 10:56
I don't think the original board would fit in that location. It would stick out past the coin door.
https://pinside.com/pinball/forum/topic/radiant-pinball-button-project
would work; but a last minute design issue killed after it had already been built in volume. 
Source: http://pinside.com/pinball/forum/topic/fs-custom-bally-flipper-button-mod#post-4090989
Source: http://pinside.com/pinball/forum/topic/fs-custom-bally-flipper-button-mod#post-4090989
Unknown feed type?!