How to repair a Mallory inductuner (Dumont RA-103, and clones) with a broken shaft

[ohohyodafarted]

Tom Carlson: If you have a precision measuring instrument, (digital caliper or micromiter) could you give me the diameter of the ceramic shaft and the width and depth of the keyway? I am going to research materials to see if I can reproduce these shafts. And at this point I am not ready to tear into my SC with the broken shaft.

Over the years I have seen a number of posts where this shaft is broken. I see a need for someone to make replicas rather than trying to fix the broken ceramics.