GMC 2012 Canyon Owner's Manual page 279

A. Blade Assembly
B. Arm Assembly
C. Locking Tab
D. Blade Pivot
E. Hook Slot
F. Arm Hook
2. Press down on the blade
assembly pivot locking tab. Pull
down on the blade assembly to
release it from the wiper
arm hook.
3. Remove the insert from the
blade assembly. The insert has
two notches at one end that are
locked by 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.