Tormek Drive Wheel With Friction Ring. Fits the T8, T7 and 2000 models.
With the introduction of the T8 model, the Drive Wheel was changed to have a body made of zinc instead of the plastic previously used. These new zinc drive wheels are interchangeable with the older plastic ones.
Tormek Part #R2020
Item #73 on T-8 Parts Breakdown Diagram