The Vision Engineering MTB210 Stabila Column is for use with the Stabila Stand Base for the Mantis Stereo Microscope Systems. The Stabila Column features a mounting point, power cable, and cable retaining clip for installing the Mantis Head. The friction in the focus mechanism can be adjusted to improve stand operation for different head weights and to adjust tension to the user's preference. Rotate the two focus adjustment knobs at the same time in opposite directions to adjust the friction. Rotate the right knob towards the user and left knob away from the user to decrease the friction. Rotate the right knob away from the user and left knob towards the user to increase the friction.