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Chalfie-
What could go wrong?
You seriously misalign the doors and they won't lock at all.
Then the Jabberwocky breaks in while you sleep...
Seriously, if you are worried then just write down what adjustment you made so you can undo them and get back to the starting point.
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With your mechanical skills? Nothing.
Mr_Sworld
andyp
It can be due to the hinges going out of alignment, so the doors aren't square to each other anymore. That can foul the multi point locks and pins.
This shows how to adjust them if they are modern uPVC.