This step is where t' shock cord is attached t' both t' body tube, and t' graphite rotor shaft. T' Rotary Revolution is a new competition style helicopter duration rocket. Ya scallywag! Specifically, this rocket is designed for use in FAI style competitions. T' model meets t' requirements o' t' S9 event, in that t' rocket is 500mm long, ya bilge rat, 40mm in diameter for 50% o' t' length. Ahoy! What makes this a very competitive model be t' lightweight hub that free-spins on t' rotor shaft, and t' lightweight balsa blades. Avast, me proud beauty! I designed t' hub for me daughter t' use at t' World Space Modelin' Championships in Bulgaria this past summer, matey, and she had pretty good results.