So, I recently purchased a new house and went about changing the locks. The doorknob worked well, but not so much on the deadbolt. Installed everything but one screw which wouldn't budge. I ended up stripping it, but was able to remove it. Since it was the same model as the old deadbolt, I figure the screws on the old one would work. I ended up jamming the screw and now even a stripped screw extractor bit can't move it. Any help would be appreciated.

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    Can you post a photo so we can tell which screw is giving you a problem? – mikes Apr 30 '16 at 1:17
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    Sometimes, drilling/grinding the head off is the best option available... – keshlam Apr 30 '16 at 3:20
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    A dremel with a cut off disk can cut a slot that a straight blade screwdriver may be able to back it out. – Ed Beal Apr 30 '16 at 9:48

You can try drilling the head of the screw, which will allow you to remove the cover of th lock and use a vise grip to un-tighten the old screw. Good Luck

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