I have a ps wood machine, The blade clamps on top are no good they wear out fast. They are metal squares with a screw going threw them. The blade slips all the time. You have to move the belts by hand to change speed, there is top and bottom pulleys. For fret work this machine is cumbersome. The tension rod on back comes lose all the time it does not stay on center, the barrels wear out and you have to buy more. There is a lot of vibration, and a little noisy. I had this machine for a some time, I played around with it and did not use it for awhile, then retired and used it more and more. I bought Excalibur 21 it like day and night.