🔧 Possible Issues & Fixes

1. Deadbolt Body Is Too Large / Hunchback Too Deep

• The “hunchback” (curved or bulky part of the lock mechanism inside) might interfere with the door frame, or not sit flush against the door.

• Fix:

  • Use a 2 1/8 hole saw to carefully deepen the mortise (the pocket in the door) to accommodate the back of the lock.

  • Ensure you’re not weakening the door structure.

2. Wrong Backset (Distance from edge of door to center of bore hole)

• Some deadbolts come in 2 3/8″ or 2 3/4″ backset. If it’s mismatched, the hunchback part may not align properly with the bore hole. Pull or twist the bolt latch to extend.

• Fix:

  • Check if your deadbolt is adjustable.

  • Use a deadbolt with a matching backset.

3. Interior Trim / Plate Hits Molding or Frame

• If the “hunchback” part is colliding with trim/molding, the lock may not install flush.

• Fix:

  • Trim the molding slightly, or

  • Choose a low-profile model of deadbolt.

4. Incorrect Door Thickness

• If your door is thinner than standard (typically 1 3/8″ to 1 3/4″), the internal hunchback piece may not fit.

• Fix:

  • Some brands offer thin-door conversion kits.

  • Or switch to a deadbolt designed for narrow doors.

✅ Recommended Actions

• Take a picture of the lock and the door area (if you’d like, I can help identify the problem exactly).

• Measure:

  • Door thickness

  • Bore hole size

  • Backset (edge to center of hole)

• If needed, choose a compact or low-profile deadbolt, such as:

  • Schlage B60N series

  • Yale or Weiser minimalist designs

  • LSDA deadbolts