For 2005 AH Astra:
All you need is a medium flat blade screwdriver (about 4-6mm) and a pair of pliers.
Using the screwdriver, insert it at the passenger end of the wiper (in Right Hand Drive countries, I don't know which end for Left Hand Drive), in the gap between the blade and the end-cap. Twist and pop the end cap off.
Now there is a soft metal pin on the top, poking into the rubber to hold it in place. Prise this pin up out of the rubber.
Slide the insert out, pop in your favourite generic wiper insert (I used Trico Multi-edge Premium), trim to length, push the pin back down with the pliers, and pop the end cap back on.
18" blades.
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How do you Change Windshield Wiper Blades on a 2004 Chevrolet Trail Blazer?
You can change the wiper blades by removing the retaining clip to the wiper blade arm. The wiper blade will come off and can be replaced.
The wiper blades are very easy to change oo a 2005 Pontiac,,its a simple snap in installation. If you need it there is a video of the process at www.youtube.com.
Change the wiper blades.
19 and a 20 inch on the front. 16 inch for the rear.
The 2000 Pontiac Bonneville takes a 22" wiper blades on both sides front. However, when buying windshield wiper blades be sure to always use the application guide book at the store. The replacement wiper blades will come with step-by-step, illustrated instructions.
this is only for the person
Blades are pressed onto posts on the end of the wiper arms. Just pull and wiggle and they'll come off.
http://www.ehow.com/how_4454148_replace-wiper-blades-toyota-corolla.html
The 2003 Mercury Mountaineer has hook-end wiper arms and are easy to change. See the Sources and Related Links section below for videos on how to change wiper blades as well as what size wiper blades are on the vehicle (correct attachment and lengths). Tip: if you purchase the replacement blades first, there will also be additional instructions/illustrations on the replacement packages. Locate and press the tab or button where the wiper blade is inserted into the hook of the wiper arm and pull wiper blade out of hook. You may have to rotate and flex the blade to make enough clearance for the hook to pass through.