I've had a DeWalt DW788 type 2 that I bought on Craigslist 10 years ago. It's knocking badly and breaks blades almost immediately. I replaced it with a new one that I bought from Amazon at the great discounted price of $399. After setting it up, I found that the blade holders were too far apart and they barely held the blade tip to tip. I contacted DeWalt, got someone who was basically a phone clerk, explained the problem, and was told that I had to go back to Amazon since it was withing the first 30 days. Amazon offered me either a discount or return, but required that I put it back in the box. I found no way of adjusting the blade distance that worked. I had all the packing, but absent of a video of me taking it out of the box showing what packing materials went were, I did the best I could. Since it's quite heavy, a special pickup was necessary. Amazon will replace it once they get the old one back. The whole process is about a week.
I'm keeping my fingers crossed that the replacement won't have the same problem. I'll let you folks know. I'd hate the think that the sale isn't because DeWalt is getting rid of defective machines with the same problem. I found an article on scroll saws.com
https://www.scrollsaws.com/SawReviews/DewltTuneUp.htmthat described the same issue back in 2006.
I found the videos from Awesomewood
https://www.instructables.com/Ultimate-DeWalt-Scroll-Saw-Maintenance-Repair-Guid/ and Bob Brokaw very helpful in trying to figure out what's wrong with the old saw. I suspect a bearing on the front rocker arm to be the suspect and have ordered one from PowerToolReplacementParts $39 instead of the $72.50 on Ereplacement parts. I can get the bearing for $20, but would need a bearing press.
Thanks to all those on this and other sites that have shared their know how and experience to help other scrollers!