Assuming you have 2nd Gen, the screws are threaded into, what are called, well nuts. These have to be taken out and moved to the upper four holes, two on each side. They can be removed in two ways, pulled out (without tearing the rubber) or pushed in and watching where they fall out. Both options have their problems. Most buy enough well nuts to fill all of the holes. That gives you the option to move the screen fairly quickly to a postion that suits you.
Last edited by david3921; 12-24-2015 at 12:34 PM.