How to Get the Best Out of uPVC Door Hinges Replacement The hinges may not be aligned properly if your Upvc doors aren't closing correctly. This could cause water leaks or draughts. Luckily there are ways you can fix this problem. A flag hinge is made up of two hinge leaves (or plates) and hinge knuckles. These knuckles are connected to a pin, axis or pin. This allows the d
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