Loosen all 5 screws, including the jacking screw (might be covered by plastic cable tie).
Re-adjust the motor gear where it is slightly touching the zoom gear.
There are 4 screws attaching the motor gear to the zoom cell gear.
The screw at the center is the jacking screw, which pushes the motor gear in and out.
Tighten the 4 screws in conjunction with the jacking screw. The jacking screw should not be forced into the part
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