PS - PK's are hex-head sheet-metal screws fitted with a non-marring washer. That what we used before clecos came along.

Hoover,

Do I have to 'smooth out' the hole after removing the PK's before
putting in the rivets? I'd think that the various 'cuts' in the
material due to the PK's might be a good starting point for a crack/rip
to develope.

The Monk