Originated From Hometips
the latch isn't lining up right and the bolt isn't going into the hole, just up to the striker plate. you have to find out where the plate (on the doorjamb by the knob, usually, unless you have double doors) should be, mortise out the hole and remount the plate
interesting question really
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them