there are many different locking mechanisms (hooks which come out of the door and lock into the frame, some with a round cam sliding lug and also a combination of both).
first thing to do is alter the keep for the initial latch (this is the part which retracts when the handle is pulled down). on the door frame there will be two small phillips screws above and below the keep. loosen but do not take out these screws, now the keep can be moved left or right along the slotted groove. adjust and re-tighten the screws once in optimal position.
note that a fully air tight seal will only be made once all of the locking mechanism has been engaged i.e when the handle has been pulled up. this is were the hooks and cams come in to play. it is mainly the cams that pull the door onto the rubber gasket in the door frame. in the middle of the cams you will see an allen key recess; turning this will move the cam in a circular motion i.e nearer and further away from the rubber of the door leaf. hence when engaged into the keep in the frame the two rubbers (gaskets) will pull tighter together if correctly alighned. also you can alter the keeps for the hooks in the same manner.
now also the hinges can come into play, especially if they are flag hinges which can make the door leaf move up and down, l or r or in and out.
just alter each part one at a time and try the door (but do take you time and do not get flustered).
iv`e tried to be as simple as i can
tom, September 2008
