Slam ramp mounting: how the pivot bolt should sit in the bracket
The slam (floating) ramp pivots on a long socket-head cap screw through the ramp shaft. The head of the screw sits in the gap of the mounting bracket, and the adjustable plate sets the ramp angle for the shot, leaving the ramp a little rotation. If a previous owner has replaced this with a home-made stud, spacers or coupling nuts, the threads in the ramp shaft can strip; fit the correct screw (10-32, 2-1/2 inch, as shown in the parts breakdown) all the way through the shaft and collar.
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Source: Pinball Repair help group!! (Facebook group)