I have a modified 901 that has a heavier piston in it that came out of a Maestro hand piece. It was given to me by DJ Glaser when I was a participant in one of the Grand Masters classes. It was also modified where the air bleed hole is in the end of the hand piece, over which the rubber flap on...
I own a 901 handpiece given to me by D J GLASER that has a modification done to it that allows a more gradual start up, in effect more sensitivity. The information about the modification used to be available on the GRS webb site. If you can't find it ask someone in their tech department to...
There appears to be quite a bit of gold involved in this job. It also appears that one of the guns is color case hardened, and the other is possibly nickel plated over case hardened steel. Both of these present problems for engravers, as case hardened metal needs to be annealed before you can...