after being away from scrollsawing for over 20 years, I decided to get my delta 40-601 saw out a couple weeks ago, and start again. when I turned it on, the speed wouldn't hold steady. doing some research, I learned the speed sensor wheel on these saws were prone to coming apart. I took the saw off the stand, turned it upside down, and removed the cover on the bottom of the gearbox. sure enough, the wheel was in 4 pieces. these wheels look like the old bakelite material, which usually did fall apart as it got old. (kinda like me!) of course, replacements are not available. my son helped me remove the shaft that held the wheel on, and its hub. he epoxied the wheel back together, both sides. yesterday we reassembled everything, and today, I was able to use the saw! woohoo and yippee! folks, im here to tell you, that im gonna have to relearn this skill. I made a good chunk of money with this saw when it was new back in 1987, but today, it was just like I had never been in front of a scrollsaw before in my life! I cant wait to get back in the shop tomorrow, and do some more! once I saw something that looks decent, ill post pictures.(if I can figure out how to do so!)