Step 7: Prepare motors for mounting
Locate one motor, along with an aluminum motor linkage, the set screws for the linkage, and a 5" 3/4-10 bolt. First, place the 5" bolt in the hole closest to the slot for the drive shaft, and place the bolt so that it will be pointing away from the motor when the linkage is attached to the motor. Next, place the linkage/bolt assembly on the drive shaft. Add the nut to the end of the drive shaft (my motors came with nuts for the drive shaft), and thread in the set screws by hand. Finally, tighten nut on the end of the drive shaft as well as the set screws.
Repeat this step for the other motor.