Can't tighten enough and fell off during four hour trip

Reducing this to two stars for two reasons: 1. The knob to tighten it in the CD slot is right next to the part holding the mount for the phone and as you tighten the knob, it hits that part and you can't turn it. 2. I noticed it was loose a couple times, re-tightened it. Then in the middle of a four hour car trip while I was using google maps on my phone for directions, the whole mount fell out of the CD slot and I had to hold my phone up whenever I needed to see the map for the next two hours as I couldn't easily pull over and re-attach it. I often make long, 8 hour trips, I can't have it falling off during the trip and I can't pull over to put it back in easily. I've used other CD phone mounts and never had them fall off mid-trip.

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