Carbon tubing consists of glue and stranded carbon fiber. If you put too much force on the ends of the tube you will fracture the tube and the threaded rod will come out during flight. The key to building this correctly is to use a brass collar (4mm ID x 5mm OD usually come with 690 or 710mm blades) as a support for the carbon tube ends. Glue the brass tubing over the ends of the carbon rod and you will never have an issue. I’ve seen other Synergy owners use shrink wrap with success. In the future I do plan on offering a rod which travels the entire length of the carbon tube in order to make assembly easier. I apologize for not including this in the kits.
