There is a Taperlock Bushing attached to the left side of the gearhead and it has three cap screws. The purpose of the taperlock bushing is to attach the customer's shaft to the 'hollow shaft'. That taperlock bushing can be unscrewed and attached to the right side if desired. The right side has 3 tapped holes that will accept the taperlock bushing as well.
The taperlock bushing has a "slit" in it. As the screws are tightened, it will cause the slit to close and to attach to the customer's shaft.
It may be possible to order extra taperlock bushings for the other side, contact factory.