1998 GMC Sonoma Owner's Manual - Page 291

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. A. Blade Assembly B. Arm Assembly C. Locking Tab I I I II 1 0 D. Blade Pivot E. Hook Slot E Arm Hook 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.