Don’t do this! The putty knife is too wide and will damage the inside of the case. You can see in the photo for step 19 how the metal clip rail has been bent out of shape. You need to use a narrower tool the will fit between the protrusions on the clip rail (which is where the clips actually are). This video shows a better, albeit more dangerous, method using an x-acto knife. I used the method shown in the video but with a #18 chisel blade on the x-acto knife. With the iPod on its back, I inserted the blade with the beveled side down. Then I pried the side out slightly and peeked through the crack with a flashlight to make sure that the blade was positioned between the protrusions, readjusting as necessary. I used multiple knives to prevent released clips from reengaging. Use this technique at your own risk, and wear adequate hand and eye protection as the blades are very sharp and somewhat brittle.