Chisel the jamb so the reinforcement plate sits perfectly flush and the strike remains aligned with the latch.

Start by transferring the plate outline onto the jamb using a pencil and a square so your cut is precise. Score the outline with a utility knife to prevent splintering and then remove finish paint inside the marked area. Use a half inch chisel and a mallet or hammer held close to the blade for controlled, shallow paring cuts, working from the edges toward the center and keeping the chisel bevel up for smoother removal. Remove only as much material as needed for the plate to sit flush with the jamb face, checking often with the plate and a straight edge so you do not overcut. If the jamb is deep or the plate requires a cavity, hog material with a series of shallow passes rather than a single deep plunge to maintain structural integrity. For metal reinforcements, slightly undercut the cavity so the plate compresses into place when screwed which reduces movement and noise. Always test the latch and deadbolt engagement using temporary screws before final fastening to confirm alignment and smooth operation.

Common mistakes include taking out too much wood which weakens the jamb and leads to a loose plate; avoid this by making multiple light passes and checking fit constantly. Another frequent issue is misaligned strike and latch which causes binding; prevent this by assembling the plate and hardware temporarily and cycling the door to confirm smooth action before final screws. Finally people often leave rough, splintered edges that cause improper seating; minimize splintering by scoring the outline first, paring to the line with the chisel bevel up, and finishing with light shaving cuts for a clean recess.

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