Quoted from Coyote:Stern 7-digit driver boards were longer than Bally 7-digit boards, and Stern 6-digit boards.
So, anything that is 7 digits, needed to be screwed in from the backside.
One of the reasons why I used Bally 7-digits in my Meteor instead of Stern 7-digits.
I wish all displays were screwed in from the backside. I like being able to shim them to keep them from rubbing on the glass.