I was in Tijuana many years ago, and watched a talented
street-craftsman ply his trade. His product was a hand pierced
pendant cut out of polished brass ( or silver, I forget which). His
"workbench" was a bench pin attached to the top of a short section of
broomstick. When he got a sale, he would sit down on the curb, sketch
the person's name in a beautiful script lettering on the flat brass
sheet, and with the customer's approval, hand-cut the name out of
brass. Sitting on the curb, he would clamp the broomstick/bench pin
between his knees, resting the bottom end of the stick in the gutter,
between his feet. He used his "bench pin-on-a-stick", a hand drill,
and a jeweler's saw to expertly saw out the customer's name in brass.
So one way to use a bench pin, depending on where you do your work,
is just to put it on a stick and clamp it between your knees. How
simple can it get?