1. Pull out the old spline and remove the old screen. Cut a new piece of screen about 4 in. wider and longer than the old one. Also cut four pieces of new spline, making each a couple of inches longer than the sides of the frame.
2. Clamp the screen to one long side of the frame. On the opposite side, roll the spline into the groove, stretching the screen as you go. Remove the clamps and add spline on the other side. Repeat the process on the short sides.
3. A spline roller has a concave wheel and a convex wheel. Use the concave end first. When all four splines are in place, roll them again, this time with the convex wheel.
4. Trim off the excess screen with a utility knife. Put a sharp new blade in the knife and pull it carefully along the spline.


