For Tarot and similar carbon fiber arms with 16mm OD and 14mm ID. This cap protects motor wires from pinch damage where they enter motor arm tubes on 650-class and similar multi-rotors. I designed this part for my own use, so that I can stand my folded quad-rotor on end for storage. This cap is also effective protection in the event of a crash.
Disconnect motor wires from ESC. Loosen motor mount clamps, slip in end cap and re-tighten. Push wires or bullet connectors through end cap and through motor arm tube. Reconnect motor wires to ESC.
Due to slight variation in tube diameters, a little sanding or a little adhesive may be required. An impermanent adhesive, like silicone is recommended.
This product is also available for 25mm motor arms.