Whe you wrote that I should use cork or a piece of rubber...I immediately thought of an accessory that is being sold for cell phones for your car.
They make a non-slip piece of rubber that lays on the dashboard of your car. You put your cell phone on it and your cell phone doesn't slide around when you're driving. The pad, isn't sticky the way that donut sugar gets on your hand. It's just a very tacky pad that had a nice grip to it.
They sell those pads at truckstops. Next time I on the freeway, I'm going to stop in and get one. I'll let you know how it works out.
In hoc signo vinces,
Michael the FaithfulPastor