So heres a simple solution that anyone should be able to make in 5 minutes, and it removes itsself in 1 second completely. I have done over 600 miles with this on highways and European country roads with some agressive turns. It was holding the tablet perfectly secure and even dampned the road bumps a little - which wasnt originally intended but works really well.
Step 1: The case
Step 2: Bend it like Banana
Next you bend it somewhat as shown in this picture. The copper strip should fit around your tablet and the bottom should hold it in place. Then you add tape to the top and bottom bends. You may also tape the whole thing but you won't see the middle piece anyhow, as it goes to the back of your tablet between the case and the case cover when folded back.