When Window Screen and Solar Screen framing is new, it is not straight, it is curved outward, bowed (or cambered). The screen frame is pulled straight in order to create constant tension on the screen fabric at fabrication. Please note this is a designed attribute of the frame.
Window, Patio and Solar Screens Screen Spline .090 -.250
Professional Screen Installation Tool Professional Grade Combination Roller
10" Steel Saw Blade 250 Tooth 5/8 Arbor For Cutting Aluminum Frame
Screen Table Jig Set Complete Table Set Includes 12 3/4" Jig Clips
Casement Clips Minimum 100