Quoted from tiltmonster:The original slide assembly were thin and cheap, thankfully mine are still okay and I'm extra careful with them, but you can buy replacements which are much thicker and should not have the same issues. Also, getting them lined up correctly is the key, good luck
https://www.pinballlife.com/playfield-slide-assembly-left.html
Have found same issue with them being so thin. And often new pivots are needed as they sometimes get jacked up. And lightly lube the contact points when you do get it working right.