I gave up when the second door had the same flaw. One I used as a
back door as the wall there was out of plumb (old house) and I could
'warp' the jamb on the lock side enough. I used the other one for the
front door and adjusted the weatherstripping enough, still had a bit
of gap at bottom corner but as it opens into a sorta 'air lock' entry
it doesn't really matter.
Easier, maybe, not necessarily as accurate.
The "trick" in my opinion, to making the measurement is to forget the
tape and use a story stick w/ a pointy end (the proverbial pointy stick
has a use here)...when the mark from one diagonal matches the other, you
know the overall frame is square. Now you can then worry about whether
there is any bow/twist/etc. in the the various components...
They are indicating to check plumb in the other plane, i.e. the plane of
the wall, not the plane of the window opening. The window may well be
plumb in that plane, and level at the head and sill, while being out of
square if it was not shimmed properly.
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