Kuzma AIR LINE 100401 - Manual (Page 11)

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In the unlocked position rotation of the counterweight is easy. To begin with, the tonearm
should be balanced to zero tracking force. This is not easy to achieve due to the very low
friction in the bearing.
Heavy cartridges (above 15g): use a small counterweight which should be firmly screwed by
hand at the end of the threaded rod for counterweight.
Light cartridges (below 3 g): as an option a lighter counterweight is available.
Add tracking force by rotating the counterweight anticlockwise, then locking the
counterweight. Move the tonearm gently with the fingers in one direction, while the cueing
device is in the up (not play) position. The counterweight support will slide along the cueing
device rod with a certain friction. The tonearm will move to a certain distance. Now repeat
the same in the other direction. A big difference in the distance travelled means that the
tonearm is not horizontal. Try to adjust the level of the turntable again, especially in the
direction along the bearing shaft.
5.4. Adjustment tangential geometry:
Protractor position
Put a record on the platter and, using the cueing device lever, lower the cartridge onto the
record. Observe the VTA. If you know, what is the best VTA for your cartridge, and then
adjust VTA by unlocking lever from 'Lock' position and rotating the knob to achieve the
desired VTA, locking the lever back gently. Remove the record and put on the geometry
protractor which should touch the side base of the tonearm. If you can, fix the platter and
protractor against rotation.