Step 3: Fit The Bit to The Keyhole

filing down the bit on the key to match the keyhole in the existing lock, making a new skeleton key for an old mortise door lock
Photo: Kolin Smith
«»
If the bit is too long, mark where it hits the bottom of the keyhole. Using a file or a bench grinder, as shown, remove just enough metal from the bit's lower edge for the bit to pass through the keyholes on both sides of the lock.
Ask TOH users about Doors

Contribute to This Story Below

    Tools List

    • bench grinder
      Bench grinder (optional)
    • warding file
      Warding file
    • table vise
      Vise

    Shopping List

    1. Penetrating lubricant, such as WD-40