Good. The original GraverMeister was set up to use a long stroke handpiece so the air pressure values were set for those parameters. Enter the new short stoke 915 and others, the pressure relief valve needs to be set to 3-1/2 psi with additional holes drilled in the pressure relief can as well. A small personal fan blowing over the Meister is also a great idea. Still a landmark invention, just needs to be tweeked for todays handpieces. jb
