Hello,
Although Con's idea method is valid and I'm sure works we simply use stronger adhesive and make sure you cover ALL the way into the corners and cut of the piece that is sticking out. Then use the heat gun to form that bond even more! Makes the repair process even faster! Also check out
g-tools if you haven't already as they make the corners perfect for the screens to fit into.
And yes, customers are anal and will notice!
Hope this helps!!