I wanted to scroll today but the racket coming from a normally quite saw has been driving me bananas.Finally i had to get to the bottom of at least one of them what was wrong.Ends up the one im using now had a bolt and nut come off or loose.You could hardly scroll an inch and the blade would break.i'll bet that's what's wrong with all of them .Same problem with each.What i think is the people that bought their DW788 had no idea on blade tension and left it sloppy and ran the machine wide open for there project.The vibration from the blade being to loose would cause something to come apart i would think.any way i took the machine apart and lo and behold here's the nut and washer and the bolt 3/4' out of the wrist pin of the connecting rod.I just ran across my loc tite but as usual when you need it you can't find it .So i put the parts back wher they go and buttoned it up ,Put a blade in and turned it wide open .No noise no vibration.so i'm good to go a little while longer.Next time i find the loc tite i'm going to hang it on a string,lol