PRO-JECT dealer to accomplish this task for you. Models Pro-Ject 9 and Pro-Ject 9c. The finger lift (1) must be fitted on top of the headshell under the cartridge fixing bolts or nuts - not between headshell and cartridge body.
Once the arm is correctly balanced return it to the rest. Hold the counterweight (8) without moving it, and gently revolve the downforce scale ring (8a) until the zero is in line with the anti-skating prong (9). Check whether the arm still balances out.