Guide to Installing Mortice Knobs with a Grub Screw and Spindle

Tools and Materials Needed

  1. Mortice knobs (with grub screw and spindle included)
  2. Screwdriver (flathead or Phillips, depending on screws provided)
  3. Allen key (for the grub screw, usually provided with the knobs)
  4. Measuring tape
  5. Drill and drill bits (if necessary for new holes)
  6. Chisel (for adjustments to the mortice)
  7. Hammer
  8. Pencil or marker

Step-by-Step Instructions

  1. Prepare the Door

    • Ensure the door is already fitted with a mortice latch or lock that is compatible with your knobs.
    • Check that the latch's square spindle hole is clear and aligns with the height you want for the knobs.

  2. Check the Knob Components

    • Verify that the spindle, knobs, grub screws, and fixing screws are present.
    • Familiarize yourself with the alignment of the grub screw hole on the knob and how it secures the spindle.

  3. Insert the Spindle

    • Slide the square spindle through the mortice latch hole until it protrudes equally on both sides of the door.
    • Double-check that the spindle moves smoothly with the latch mechanism when turned.

  4. Position the First Knob

    • Align the first knob onto the spindle. The side with the grub screw hole should face toward the spindle for secure attachment.
    • Push the knob snugly against the door surface.

  5. Secure the First Knob

    • Tighten the grub screw on the knob using the provided Allen key. Ensure it clamps onto the spindle securely.
    • Test the knob to ensure it does not wobble or slide.

  6. Attach the Second Knob

    • Slide the second knob onto the opposite end of the spindle, pressing it flush against the door.
    • Align the grub screw hole with the spindle and tighten the screw using the Allen key.

  7. Fix Both Knobs to the Door

    • Use the fixing screws provided to attach the knobs' backplates or roses (if applicable) to the door.
    • Ensure the screws are tightened evenly to avoid tilting.

  8. Test the Mechanism

    • Turn the knobs to ensure they operate the latch smoothly.
    • Check for any wobbling or misalignment and adjust as needed by loosening and re-tightening the grub screws.

Tips for a Perfect Installation

  • If the spindle feels loose in the mortice latch, wrap it with a layer of adhesive tape to improve fit.
  • For a secure and professional finish, ensure all screws are fully recessed and flush with the surface of the knob or backplate.
  • If the grub screw does not tighten properly, double-check that it aligns with the flat side of the spindle.

By following these steps, you should have a properly installed set of mortice knobs that function smoothly and look great on your door!