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Types of Double Glazing Door Hinges If your door meets at the top and bottom, but has a gap in middle, it could mean that the hinges aren't in alignment. This is a simple fix. Simply make use of an Allen key to rotate the screw that adjusts the compression a little. Mr Misty can adjust or repair and replace upvc double glazing door hinges to make sure your doors are in good working in order to avoid draughts, leaks and damage. Butt Hinges A butt hinge is a form of hinge for doors that has two flat plates joined