http://www.instructables.com/id/ELEV-8/
Step 5:
Next, we're going to fasten each motor to its mount. Put the top mount (the one with the larger hole) onto the motor first, then screw the bottom mount on (you should be
referring to page 2 of the Assembly Diagrams now).
Fasten the motor mounts to each other with plastic spacers, washers, and bolts. Don't forget to slide the 3 motor wires down the boom before tightening everything up.
