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Types of Double Glazing Door Hinges If you have a gap between the top and the bottom of your door but the top and bottom are aligned perfectly and the hinges are in perfect alignment, then your hinges could be out of alignment. This is a simple fix; simply make use of an Allen key to turn the screw for compression adjustment a little. Mr Misty will adjust, repair, and replace your double glazing hinges made of upvc to ensure they are in good working condition and stop damage, leaks, and draughts. Butt Hinge