Threshold adjustment quite easy once I took the time to understand how the adjustment rod works. I have this to allow for a gap under my door. It helped but the bottom of my door is obviously quite wobbly and still not perfect. Just note that the adjustment will only effectively raise/lower one or both sides. For example, if you have a curved gap in the middle of your door, you can't adjust it so that it's higher in the middle. All in all, this is a well-made product and definitely worth the money.
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