Also does anyone know what the size of the screws that hold on the rotar blades are part number 6 in the instructions? My rotary airfoil head got knocked of the bearings and when I was taking one screw out it got stripped. Another thing being the big dope that I am and not to good with small parts I broke of one of the ball joints on the rotary airfoil head. I guess im going to epoxy it for now. Any good links for a new one?