Here is a little trick for piece of mind. Drill a very small hole in each side of the grey colored seesaw. Then when the pins are in put a dab of epoxy in each hole. Also make sure you fit the a-arms to the pins. You want them to pivot freely on the pins, not sloppy or tight just moove very freely and smooth. You may have to remove some material from the inside of the a -arms to get the clearance or even run a small drill bit through them. This is what really makes a difference in how a helicopter flies. You would not belive the difference when you take the time to make everything work super smooth as compared to just assembling it.[8D]