[Roger Henrichs]

Dan,
The shims are used to lengthen the stroke to add power and slows the strokes per min. down. The Artisan and Classic have a removable sleeve and piston. The shims are located at the base of the sleeve.To add shims, pull off the rubber handle, drop the piston out and pull the sleeve, add the shims and put it back together. Not to difficult to do. I had the shims in for testing and have taken them out.

I'm a old convert from chase hammer and chisel and push gravers. If you have never used air assist you will be suprised at how the AirGraver virtually eliminates slips and fatigue.

Roger