I just completed this fix and was very careful not to rip the chip off. I recommend going very slow and using a sharp knife to reach in and separate the glue, especially when you get to the chip in the very center.
As an alternative, the center of the screw in question is about 1/8" to the left of the "D" in "Developed by Apple...". If you use the sharp tip of a knife or a razor blade and very carefully twist a small 1/8" diameter hole, you'll reveal the screw, and you can gain access to adjust it without ever taking off the plastic backing, avoiding the risk of destroying the electronics. That's how I'd do it if I had to do it again.