Pro-Ject Audio Systems Pro-Ject Signature 12 - Manual (Page 6)

c) Headshell assembly
Plug headshell into the front of the tube. Connector pin must be oriented into the groove. Fixing nut tighten on
the tonearm tube properly.
d) Counterweight assembly
Put on counterweight on the support rod. Tighten the locking screw gradually and watch than the shaft entry
into thread groove. Then tighten the locking screw. Correction of counterweight’s weight is provided by
additional counterweight is also tighten by the set screw.