Hi, I had the same problem Be very careful. I broke one rotor trying to put it on. Second try with new blade was enough force to pop out the back of my rotor moter. The way to do it is lay the heli on its side and support the back of the rotor motor. Press the rotor on as best you can the tap on with a small hammer. A block of wood will work for support on the back side. Once you get it going you just tap tap tap till the beveled side is flush with rotor box. That is the only way to do it with out popping your motor back plate out. This method works.. good luck.