About the only adjustment that I have made is turn down the idle. It would just take off in reverse. I have it bottomed out and I think it is still too fast. That is a different topic.
Hi Smutts I don't get a twinkle of a vibration surprisingly.I used 6 feet of vinyl tubing.The tubing is 1/8" heavy wall and with only 9 psi I wouldn't think it to be flexible enough to dampen things out. The gauge cost 15 the tubing was another $1.25 for the length, Oh and a couple for the tee. Adding a pack of ciggys might put my project over the top