FAR K103 Manuel D'utilisation page 70

Horizontal mounting
The unit must be set up horizontally to minimize
vibration. To set the unit horizontally, it must be
standing upright, with its two adjustable feet in
stable contact with the floor. You can also adjust the
horizontal setting by unscrewing the front adjusta-
ble feet in the appropriate position (use your fingers
or an appropriate wrench).
GB-17