Hi, I have a 16 year old double-key deadbolt lock on my front door, don't know brand. See attached photo. A few years ago it got stuck--key is not stuck in lock but it won't turn enough to open door. At that time the locksmith talked me through it. It had something to do with aligning the two screw holes correctly. Just can't remember the details. When I turn the key part way the screwholes open up but aside from spraying WD40 in there don't recall that to do. I do recall it was very simple. I just looked at photo and for some reason it came out horizontally, at least on my screen. It should show two screw hole covers right and left of keyhole; so in your mind imagine it turned 90 degrees clockwise.
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