Graco Contender Slim Instruction Manual page 52

9. Tighten the Lower Anchor Strap
Press down firmly in the center of the car seat while
tightening the lower anchor strap
You may need to tighten through
the forward-facing belt path
from the other side of the seat to
get a tight fit.
10. Attach Tether Strap
Extend the tether strap pressing
the grey button and pulling out
on the strap and attach to the
tether anchor point.
Consult vehicle owner's manual for specific location.
11. Tighten Tether Strap
Remove all the slack. Tether strap should lie flat and
not be twisted.
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