Chuck:
Couldn't tell you if it is original or not, but you should be able to
repair it. What has likely happened is the threaded insert has lost the
knurling that holds it to the knob.
TIghten the knob so that pattern is properly oriented, scribe a mark on
the insert and knob for reference, and remove the knob and pull the
insert from it (you might be able to pull the knob off the insert from
the shift lever).
Rough up the mating surfaces and apply a good two part epoxy and
reassemble the insert and knob. Put a dab of grease on the tip of the
shift lever to keep it from gluing to the epoxy. Reinstall the knob
assembly to the lever while the epoxy is still wet (to allow for
adjustment) and make sure it is oriented properly. Let it dry overnight
and it should end your problems.
If your shift knob doesn't have the nut on the bottom of the insert, you
can probably pickup up a set of standard inserts for a shifter knob at
your local parts store; Hurst makes a set, as does B&M. You could also
try using a long nut of the proper thread pitch. The nut lets you use a
wrench to tighten the knob, so you run less of a risk of twisting it
loose.
Hope you have a great day!
Rich
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