Main Bearing Spindle (inverted) for RPM6, RPM6.1, RPM6.1SB, RPM9 and RPM9.1

The Pro-Ject RPM6, RPM6.1, RPM6.1SB, RPM9 and RPM9.1 have an inverted bearing unlike the other Pro-Ject models. 

With the Inverted bearings, the bearing housing is an integral part of the platter on the RPM9 models and with the subplatter on the RPM6 models. 

This piece is the other half of the bearing assembly which bolts onto the plinth.  The bearing spindle is tipped with a high precision ceramic ball.