Originally Posted by wahoonc
the old spline will be too short, it has drawn up over time. It works best to install the new screen while the frame is mounted to the wall, otherwise you will get wrinkles in it because of the curvature of the wall.
The original spline on our '74 was just fine for replacing the screen. It is
flexible, remember. No problem re-using it, but it's your money.
We found that to avoid wrinkles just took getting over a learning curve. It was fairly easy to do, once we had a few behind us. The key is to have the same tension in both directions. You may have to pull out some spline to correct a problem or two at first, but you will soon be an expert.
We found that it was better to take off the screen frame; it made cleaning the frame up a lot easier, and you could work on it in a comfortable position.
Have fun doing it!