All for you!
The part where the CD would go, which is resting on my netbook (which is resting on my laptop... I bet my laptop feels betrayed!) was the side taped to the car.
You will notice a second spring. I pushed the glue through with a pen, but the second one fell off before I taped it to my car, so it went with only one spring.
And how did it work, you ask? As a proof of concept, it worked 100% as planned. I placed a large chunk of brown ice/slush in front of it, and rolled forward, so the chunk hit the CD case, the CD case was pushed back by it, and once it was clear, it jumped right back into place. Now onto a REAL one, and forward onto 'permanent' ones! I'll get a video later on.