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It is common these days for the wood used for jambs to be too soft to hold a screw against the forces imposed by a heavy door. Solution is to screw through the jamb into the stud framing behind it. Use 3 or 3.5 inch deck screws. You can literally adjust the set of the door with these by backing them off, 1/4 turn at a time, or screwing them further in. They will take the frame with them. This can not be done with factory 3/4 screws as they have no effect on the jamb.
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