Look up you serial number on Bushton's site. They have a pretty good listing of them in the manuals section. If you post a picture of your saw, we can determine what you should look for. The number one thing is the motor. If it has a Fasco motor, you may have problems with it down the road. The style of lower blade clamp is another thing. Also, check at the rear where the tensioning is done, look at the "V" notch in the upper arm. See if it has any undue wear. There should also be a nylon washer between the tensioning knob and the "V" wedge that goes into the notch of the upper arm. In the front of saw, it should have a tension lever and upper clamp piece. Make sure that is lubricated well. You can download a manual for it if you didn't get one. Best of luck with your new toy.