Thanks David,
How vigourously does the negative holder area vibrate?...on mine, even with 'stroke intensity' turned to full, the vibratory effect seems very minimal..does that sound about right or does my machine need some repair or overall perhaps?..i can sense some kind of vibration (and a definite hum) but its pretty minimal. I tried a lead pencil and i have the maginfying binocular attachment. Resting my hand on the hand rest, the vibration of the negative stage area did'nt seem enough to have much influence on the lead pencil tip touching the negative surface.

-andrew