Re: Sagging Storm Door
If I'm reading your description correctly .....check all the screws in the hinges .... it may just require 1 or 2 longer screws installed into the top hinge on the door frame side. Usually the screws are short ..... with longer ones they will bite into structure behind the door frame.
You might also check the door opening by doing a diagonal measurement from the top corner down to the opposite lower corner in both directions .... to see if the opening may also be racked. If so you might end up planing the door to fit.
"" an ounce of perception -- a pound of obscure "