You might wish to look into this:
Running rough from Kip Scrollin' with an Ex-21 http://tidewater-creations.com
In recent months it has slowly but surely started running rough. Not really a vibration like before but seems to be in the upper arm. If I lift up on the arm the sound and vibration stop. I didn't realize how bad it had gotten until today when the speed control knob started clanging and I tightened set screw to fix it. Took note stock of the situation and realized how bad things are. An update...decided to wait till after the holidays to phone Ray @ Seyco as I was sure this was going to be a long process that involved taking the machine apart and tracking down various potential issues. Well of course I was wrong and it took all of 1 minute for Ray to diagnose...LOL Did have to modify a wrench but all is well My problem developed over time and it's best described as running rough with sounds and vibration getting much worse as speed is increased. At full speed the quick release lever would pop open. The repair was simple: remove cover from back of saw opposite motor and tighten screw in cut out area. If screw continues to turn you must apply a modified 8mmwrench to the back side and hold bolt. Tighten firmly. As shown you must add a "bend" in the wrench. You can heat it and bend it in a vise or take a hammer and beat the tar out of it. I fully recommend the later as it works great and is a stress reliever as well I have added pics in case this wasn't clear.
DW
Love that Randy. That came out great. Always knew that you could deface coins as long as you did not try to pass it off as another value otherwise those penny rolling machines would not have been so popular in the carnivals and amusement parks. What got you into coin cutting Randy?
DW
Sorry hear about that Dan, this happens to all of us from time to time. I got to the point were I work on a table and never in free air. The piece is flat on the table where it is supported. I got tired of either enlarging the designer firewood pile or gluing it back together.
DW
The first was for the folks down under in Australia the other for the rest of us Great job on that I really like that. Thanks for sharing this with us. Love live edge wood use.
DW