By adjusting the key or with a screwdriver to adjust the fuselage side hole \"ten\", will voice slowly down to the appropriate state, nor a tuning is too small oh, adjustable small underpowered oh. 4, the barber knife blade will drop down this kind of situation is that little tongue short solution: A, come down, the blade under the fuselage cover behind A few holes, one with A little black stopper blocked, use A needle to pick out the small plug, then use A screwdriver twist screws, we can see the tongue A bit longer, then the blade