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In order to remove a mini IR helicopter main rotor, the main metal shaft must be held stationary with a pair of needle nose pliers, or a pair of thin vise grips. Grasp the shaft right below the bottom of the rotor, and while holding this stationary twist and pull the old damaged rotor off. If the old rotor is on too tightly to remove and you are comfortable using a sharp hobby knife you can shave plastic off of the side of the main rotor shaft until you get down to the metal, essentially cutting the damaged rotor in half so it separates and removes easily. Once the old rotor is off, continue holding the metal shaft with pliers, and gently press the new rotor onto the shaft. The rotor only needs to go on far enough that it becomes snug but you can get it on farther by holding the main shaft with pliers, turning the helicopter upside down and tapping the rotor against a hard surface like a counter top, driving the metal shaft in further. If the new rotor is loose, put a drop of CA glue or silicone adhesive on the metal shaft before sliding the rotor on, and allow adequate time for it to dry.
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