Thomson TBS Worm Gears are installed directly to the unit and require no intermediate coupling between the two. To install the gear to the motor, a bell house flange must be used between the gear and the motor. The bell house flange, which includes a matching coupling, is ordered separately. A shaft cover can be ordered to cover the second primary shaft on the gear in case it is not being used. We have multiple options available – please contact us to discuss your requirements. Worm Gears TBS Datasheet