Pro-Ject Audio Systems Pro-Ject Signature 12 - Manual (Page 7)

Setting range of counterweight:
1. Counterweight without additional counterweight
This setting balance cartridge with weight 4.5 – 8 gr.
2. Counterweight with additional counterweight with dimensions Ø15mm, length 30mm.
This setting balance cartridge with weight 8 – 15 gr.
3. Counterweight with additional counterweight with dimensions Ø15mm, length 45mm.
This setting balance cartridge with weight 15 – 23 gr.
Please note that the maximum visible part of this additional counterweight is 21mm.