The Pro-Ject 66g Counterweight (009) is a genuine replacement counterweight for Pro-Ject tonearms that use the 009 counterweight series. At 66g, this is a lighter counterweight in the Pro-Ject range, designed to balance the tonearm correctly when used with heavier cartridges, or in situations where the standard counterweight cannot be positioned far enough towards the rear of the arm to achieve the correct vertical tracking force (VTF).
What a Counterweight Does
The counterweight mounts at the rear of the tonearm tube, opposite the cartridge. By sliding the counterweight along the stub and rotating it, you set the downforce that the stylus exerts on the record groove. Setting the correct tracking force is essential: too little and the stylus will skip or mistrack; too much and both the stylus and your records will suffer premature wear. Each Pro-Ject tonearm counterweight carries a numerical part code that identifies the correct mass and thread specification for that tonearm family.
66g Weight and Tonearm Compatibility
The 009 series counterweight weighs 66g, placing it towards the lighter end of the Pro-Ject counterweight range. A lighter counterweight is used when the cartridge body mass is high, as it must sit further from the pivot point to achieve balance, giving a broader VTF adjustment range. The 009 designation refers to the thread specification and mount type, ensuring a precise fit on compatible tonearm rear stubs without play or vibration. This counterweight is suited to EVO series tonearms and other Pro-Ject 009-mount arms. If your existing counterweight has been lost or damaged, or if you are upgrading to a heavier cartridge, this is the correct replacement for 009-series tonearms.
Installation
Thread the counterweight onto the rear stub of the tonearm by hand until it seats securely. With the cartridge and stylus guard fitted, balance the tonearm parallel to the platter surface by adjusting the counterweight position. Once balanced, set the tracking force dial to zero and then rotate the dial to your cartridge manufacturer's recommended VTF figure. Always re-check alignment and anti-skating settings whenever a counterweight is changed.