Open the freezer door. Remove the lower basket. Remove the two screws from the guide rails (one from each side). Lift the freezer door up to unhook it from the rail support and remove. Pull both rails to full extension. First: Remove the gear from the left side first by releasing the tab behind the gear, place a screwdriver between the gear and the tab and pull up on the gear. Second, remove the center rail. Third, remove the gear from the right side by following the same steps for the left side.
Reinstall the right side gear into the clip. Insert the rail into the right side gear. Gears do not need to be perpendicular to each other. Insert the rail into the left side gear, and insert the gear into the clip. The rail system will align itself by pushing the rails all the way into the freezer section. Pull the rails back out to full extension. Reinstall the freezer door by inserting the rail tabs into the guide rail. Reinstall the two screws into the guide rails (one from each side). Reinstall the lower basket, and close the freezer door.