theres a cap underneath that pops open, that adjusts up or down, and towards and away from the hinge, be careful because it does both at the same time. or if you open the door and look at the back of the hinge theres a nylon button you can press that opens the front cover where you can adjust towards the lock catches or away
The gap is on the hinge side of the door. It's only around 1 or 2 mm so that the rubber seal doesn't make contact with the door allowing a draft to blow through.
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