As I mentioned before the flap on the storm door sweep got tore loose.

I removed the old flap on the U shaped adjustable channel bottom. thoroughly cleaned the bottom surface and installed this self stick seal. Stuck real good and the 3/8 height was the same dimension as the old flap height.

Installed back onto storm door and done adjustment for seal to threshold. Works great.

Problem solved. See how long it lasts.

https://www.homedepot.com/p/M-D-Building-Products-3-8-in-x-3-8-in-x-17-ft-Brown-Premium-Silicone-Rubber-Window-Seal-for-Ex-Large-Gaps-43848/100353450