Pushrod set for shaft 35/12 Pushrods are made of steel, not hardened. Depending on the place of installation their diameter is 2.5 or 3.0 mm. These pushrod sets are designed specifically to match the mechanics of all Sky Fox helicopters. All you have to do is check the length of your rotor shaft, because this dictates the length of the collective pitch pushrods. If you are using the rotor shaft 35/10 (194 mm) you should use the set 70/11. For the rotor shaft 35/12 (204 mm) you need the set 70/12. Both sets contain the pushrods which run up from the servos to the rotor head.