The following items are not included and must be purchased separately:
[Qty. 2] 9G EXI Digital Metal Geared Servo
[Qty. 2] 3x7x3 Ceramic Ball Bearing

You will also need a suitable bolt for mounting the GoPro to the gimbal. The gimbal connector is designed to fit the polycarbonate GoPro enclosure just as any other gopro mount does, however, the stock bolt handle is too long.

Assembly is fairly simple, much of the gimbal is already assembled.
1.) Insert the roll bearing into the inner ring.
2.) Insert the 35 tooth gear into the roll bearing with the 10 tooth gear facing away from the bearing. Be sure that the roll ring is properly centered along the rail before the 35 tooth gear is meshed with the outside ring.
3.) Fix the 30 tooth gear to the roll servo, center the servo, and then either bolt or glue the servo to the inner ring.
4.) Insert the pitch bearing into the middle ring.
5.) Attach the pitch servo to the outer ring using either glue or bolts.
6.) Center the servo and insert the servo gear into the hole opposite the pitch bearing.
7.) Use the screw supplied with the servo to fasten the pitch servo gear to the gimbal.
8.) Insert the pitch pin opposite the pitch servo and glue it in place.
9.) Now the rubber dampers can be inserted into the gimbal mounting holes and the gimbal can be attached to the loading pipes of the frame.