Until I get a chance to post the pics, you can go about it by diconnecting the current motor and gear drive mech. Desolder the old motor, note polarity + to +, - to -, remove everthing from the tail section. With a Dremel or X-acto, open the center hole enough to fit the new bigger motor. Install the new motor, screws included with gws motor, and press on the DD prop. Some slight reprogramming of your 4in1 may be necessary and your off. Pics tomorrow.