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Types of Double Glazing Door Hinges If your door meets at the top and bottom, but there is a gap in the middle, it could be that the hinges aren't in alignment. It's a simple fix. Simply apply an Allen key to turn the compression adjustment screw just a bit. Mr Misty can adjust or repair and replace upvc double glazing door hinges to ensure that your doors are in good in order to avoid draughts, damage and leaks. Butt Hinges A butt hinge is a form of hinge for doors. It has two plates made of flat