This is what happens when you wait to long
to have your clock serviced!
The pivots are the small ends of the gear shafts
that spin inside the holes on the plates.
When abrasive dirt gets into those holes,
and the clock is run for years and years without service,
the steel of the pivots can, in some cases,
be ground down so badly that the only remedy
is to replace the pivots.
The pivot shown here was 0.031″ in diameter