There are a few ways to fix a rear cup holder in a Ford F150. Here are two ways:

Way 1:

Remove the cup holder.
Clean the cup holder and the mounting area with a damp cloth.
Apply a small amount of adhesive to the back of the cup holder.
Press the cup holder back into place.
Allow the adhesive to dry completely.

Way 2:

Remove the cup holder.
Drill a small hole in the bottom of the cup holder.
Insert a screw into the hole and tighten it with a screwdriver.
Reinstall the cup holder.

Here are the steps in detail:

To remove the cup holder, you will need to reach into the back seat and locate the two tabs that hold it in place. Press these tabs inward and the cup holder will pop out.
Clean the cup holder and the mounting area with a damp cloth. This will remove any dirt or debris that could be preventing the cup holder from fitting properly.
If you are using adhesive, apply a small amount to the back of the cup holder. Be sure to apply the adhesive evenly so that the cup holder will sit flush against the mounting area.
Press the cup holder back into place and hold it there for a few seconds. This will help the adhesive to set.
If you are using screws, insert one screw into the hole that you drilled in the bottom of the cup holder. Tighten the screw with a screwdriver.
Reinstall the cup holder and test it to make sure that it is secure.

If the cup holder is still not fitting properly, you may need to replace it. You can purchase a replacement cup holder from a Ford dealership or an online retailer.

Here are some tips for preventing your rear cup holder from breaking in the future:

Do not overload the cup holder.
Avoid putting hot or cold drinks in the cup holder.
Do not place heavy objects in the cup holder.
Clean the cup holder regularly.

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