Mercury 1999 Villager - Manual (Page 144)

4. Rotate the tether strap.
5. Clip the tether strap to the seat
tether slot bracket at the lower rear
portion of the seatback.
If the tether strap is clipped
incorrectly (as shown) the child
safety seat may not be retained
properly in the event of a
collision.
Seating and safety restraints
144