Sentra L4-2.0L (MR20DE) (2010)
5. Pop-off/remove the head restraint clip by gently squeezing together the spring and bar as shown in Figure 4.
6. Remove the head restraint spring by lifting it up and out of the seat frame.
7. Install the new spring listed in the Parts Information section.
a. Insert one side of the spring into the seat frame.
b. Insert the other side of the spring into the seat frame.