On Sep 13, 1:05*pm, George wrote:

snip

The problem is, one of these doors appears to be warped: the center top
is pulled in relative to the stop moulding, and likewise relative to its
mating door, which it should close and latch with. *AFAICT, it is the
door itself, not the frame, which is warped.


Your odds of success are not that good because the large glass areas
don't contribute much rigidity. Best consider having a new door
constructed at a good carpenter/woodworking shop. Well seasoned lumber
could make the big difference in getting a warp resistant replacement
door.
Trying to get the current door flattened by clamping to some other
flat structure is dicey and likely rather time consuming. Your
neighbors would wonder why you had the front entry boarded up while
this was ongoing.

Joe