[Hallicrafters] SX-101 Question

[Larry]

Over the weekend I picked up a very nice SX-101 MKIII with great 
cosmetics.  I am going to re-cap it over the next few weeks.  One thing 
that puzzles me is the "Pointer Reset" knob.  How does it work?  Does it 
mechanically move the pointer or does it do it electrically by shifting 
the local oscillator freq?  The reason I ask is that the shaft appears 
loose or disconnected over about a 45 degree rotation with hard stops on 
each end of the rotation.  What's involved on getting access to the 
mechanism?

This is my first SX-101 and am looking forward to getting it up and going.

Thanks,
Larry W4LK