Stanley Schaefer fired this volley in news:9f7cc9e0-
:

So I
think your arbor is overengineered unless it was intended for driving
some other gizzy

I'll agree, and go further with that thought.

Spiral pins are easy to remove (as opposed to roll pins).

There is no apparent reason for that pin to be easily removable, unless
it's intended to be removed.

Lloyd