[header] How to measure a screen spline [title] Remove the screen frame from the window. [step] Check for clips holding your window screen in and, if you spot any, lift the clips up to unfasten the screen from the window. In most cases, your window screen frame should pop out easily. 
[substeps] If your screen frame is secured by clips, they should be located along the left and right sides. After removing the frame, lay it down on a flat surface like a table.