Haven't had to use this info Brett as I haven't got a Pro Stern .
Just thought I'd offer up a bit of helpful info to any Stern owners with pins that have these rails ....
Well . You know when you are sliding the playfield back into the cabinet how it hits that "bump" at the back of the support guides ...
Most people tend to go up the side of the machine and grab the back of the playfield and lift it up while pushing in from the front .
With these rails there is no need . Slide the playfield in until it hits the bump . Now from the front grab a hold of both down sections of the slide brackets and push slightly down while pushing in . The playfield will slide in easily . Very handy if you have your pins close together in a lineup .