Let me try answering your other question here.
When the level is placed-either top, botton,left or right, it reads level. The carpenters square reads square when plased on ANY of the old, original window framing. It even reads square when the window is open and it is placed where the window sash hits when closed. It reads out-of-square when placed where the top and bottom sash meet when square placed here and otherside of the square placed against the frame of the replacement window.
Same reading occure when square placed on the bottom of the sash (where you pull up/push down to open/close window) and other side is placed against the frame holding in the glass. So, somehow the sashes are somewhat of a parallellagram-yes, but you'd never know it from looking at them.
Sorry to be so confusing, but these windows seem to be stumping everyone.
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