ION iTTUSB - Manual (Page 5)

iTTUSB Owner's Manual V5 - Page 5
TONE ARM SETUP
First, place cartridge and headshell into the front opening of the
tone arm and then turn the tone arm lock nut clockwise to secure
the cartridge and headshell onto the tone arm. Do not
overtighten but make sure that cartridge and headshell are
not wobbling!
1. Begin by rotating the counterweight clockwise until it is in the
complete forward position (NOTE: this is also the maximum
amount of pressure that can be applied to the cartridge.)
2. Now there should be a feeling of weight and resistance when
the head shell is raised and lowered. Begin rotating the
counterweight counter-clockwise (away from the pivot point)
until the weight and resistance feeling is gone. If done
properly, the tone arm will pivot with very little resistance back
and forth indicating that there is exactly 0 grams of stylus
pressure.
3. With the counterweight in its new position further away from
tone arm pivot point, grasp the scale ring of the counter
weight and rotate it until "0" is in the vertical position.
4. Finally, rotate the counterweight (and scale ring) clockwise
(towards the pivot point) until the desired amount of weight is
reached. If the scale rotates 360 degrees beyond the zero
point, the new scale ring reading should be added to 3.5.