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My door lock has 3 screws that attach the lock portion to the wooden door. 2/3 screws no longer "grip" the wooden door as when I drill it goes straight through the hole. Moving the lock is not an option. I was thinking of filling the existing hole with some type of putty and then drilling into it but not sure how to approach the problem properly.

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    Get a wood dowel that's a bit over the size of the existing hole, drill that hole out to the size of the dowel, apply a good glue to the dowel, and tap into hole with a hammer. Once set, chisel out the dowel so it's even with the surface. Once the glue has cured, drill out new holes for the screws.. – BillDOe Jun 5 '18 at 23:10
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    BillDOe, that's a valid answer and should be posted as such. Comment section is for questions for clarification and related matters. Your answer is certainly an acceptable one. – fred_dot_u Jun 5 '18 at 23:24
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Your putty (or better, wood filler) approach will kind of work, but that isn't a good solution for holding screws in wood. Those products tend to crumble and don't bond all that well with the wood, so they don't hold up well for this use.

BillDOe's dowel solution is a standard way to get strength roughly equivalent to the original wood. There's a simpler version of the solution. Fill the old holes with glued wooden toothpicks.

You break the toothpicks in half and alternate fat side or thin side in. Dip the toothpick in wood glue, and stick it in the hole. Add more until you've filled the hole and can't push any more in.

Find a nail that's a slightly smaller diameter than the body of the screw (the core under the threads), coat it with a little Vaseline, and tap it into the middle of the toothpicks while the glue is still wet. This will compress the toothpicks into a solid mass and create a pilot hole for the screw.

When the glue is dry, remove the nail and trim off the toothpick ends sticking out from the surface.

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