Unscrew the four JIS #000 screws holding in the metal lens mount.

Grab the metal ring directly below the lens mount and pull upwards. It is best to keep the metal ring, the lens mount, the lens mount washer, and the weather seal together as taking them apart is not needed.

Next, remove the four Phillips #00 screws around the outside of the fixed barrel assembly.

Be sure to remove the screws that are recessed into the lens, and not the screws that are sticking off of the lens (those ones are only for holding the tripod mount onto the lens).

Pull the fixed barrel assembly directly upwards.

Use caution while removing the fixed barrel. The main PCB assembly sits around the inside of the fixed barrel, so you don't want to push against it while lifting off the fixed barrel.