Step 4: Fit The Bit to The Lock Case

fitting the skeleton key bit's width to match the width of the lock case, making a new skeleton key for an old mortise door lock
Photo: Kolin Smith
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Now check the bit's width by resting the swollen knuckle of the shaft—the stop—against the edge of the case, as shown. (The tip must project past the other side.) Mark where the bit's front and back edges need trimming for it to turn inside the case. File those edges to fit.
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    Tools List

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

    Shopping List

    1. Penetrating lubricant, such as WD-40