Also bear in mind that blind rivets are but one style. In short, you
can't tell much of anything about a rivet by looking at the head,
except to know that the head is bigger than the shank.


Engineer types take notice! But maybe he quickly reached down, yanked
it out, measured and tested to see if it was high grade SS and so on.
Being the Engineer type I bet he also counted them and observed the
spacing for load distribution.
Yup...he's the engineer type alright.

RB
35s5
NY