This official tool is used for adjusting tonearm bearings, it is a cost friendly alternative to the Pro-Ject: Adjust It tool. WARNING: Pro-Ject & Turntable Lab urge listeners to always use extreme caution when adjusting their turntable's tonearm bearing. Getting this right is critical for the overall performance of the tonearm, as well as for the preservation of record grooves. Not recommended for beginner turntable enthusiasts.

• instructions: loosen the bearing screw just barely to the point where there is perceivable play, make your very careful adjustment, then tighten so that there is no play at all. It should never be tightened beyond that point.
• official Pro-Ject tool for finely adjusting your tonearm bearings
• suitable for all Pro-Ject turntable tonearms
• part #: 3944211000
• for use by qualified personnel only (note: misuse of this adjustment tool may damage tonearm bearings)