Now you will be fastening the motor mounts to the booms and attaching one side of the landing gear.
*When determinig which machine screw to use, use the screws with a length that is equal to or just shorter than the length listed. Industry standard tolerance for machine screws allows them to be up to 1/16" shorter than their numerical size.
Before you begin, view the ELEV-8 Prop Guard Kit tutorial [4] videos, and decide whether you will add this accessory to your quadcopter. It is highly recommended to help reduce repairs and property damage if you are learning to fly. If yes, then assemble each section according to the video, and attach to each boom as you proceed from Step 3 below, but using the longer screws provided with the Prop Guard kit.
If you elected to use the Prop Guard Kit, each boom will instead look like this:
Links
[1] https://learn.parallax.com/sites/default/files/content/ELEV-8/v3-Assembly/v3-HardwarePackSingles-Labeled.png
[2] http://learn.parallax.com/sites/default/files/content/ELEV-8/v3-Assembly/v3-HardwarePackSingles-Labeled.png
[3] http://www.parallax.com/product/80310
[4] http://learn.parallax.com/node/1737