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Types of Double Glazing Door Hinges If your door has a gap between the top and bottom but has a gap in the middle, it may be that the hinges aren't in alignment. It's simple to fix. Use an Allen key and turn the compression screw slightly. Mr Misty will adjust, repair and replace your double glazing hinges made of upvc to ensure they remain in good working order and prevent damage, leaks, and draughts. Butt Hinges A butt hinge is a kind of hinge for doors that has two plates made of flat that are jo