GMC 2007 Envoy Denali Owner's Manual page 437

3. Remove the insert from the blade assembly.
The insert has two notches at one end that
are locked by the bottom claws of the
blade assembly. At the notched end, pull the
insert from the blade assembly.
4. To install the new wiper insert, slide the
insert (D), notched end last, into the end
with two blade claws (A). Slide the insert all
the way through the blade claws at the
opposite end (B). The plastic caps (C) will be
forced off as the insert is fully inserted.
5. Be sure that the notches are locked by the
bottom claws. Make sure that all other claws are
properly locked on both sides of the insert slots.
A. Claw in Notch
B. Correct Installation
C. Incorrect Installation
6. Put the blade assembly pivot in the wiper arm
hook. Pull up until the pivot locking tab locks
in the hook slot.
7. Carefully lower the wiper arm and blade
assembly onto the windshield.
437