Rotate the upper gear ring fully clockwise.

Hold the intermediate barrel above the front portion of the lens and feed the 2 long ribbon cables up through the intermediate barrel.

Lower the intermediate barrel into place.

The zooming key should go into the slot on the front part of the lens.

Line up the screw holes on the intermediate barrel and the front of the lens. Also make sure to line up the ribbon cables with the cut outs in bottom of the intermediate barrel.

Screw the five M2x6mm Phillips #00 screws into the bottom of the intermediate barrel, locking it onto the front of the lens.