Machinist's art
 

Colombia Propellers was located in the town whereI grew up ....I used to see some seriously pretty props come out of that place..sometime would see six foot screws strapped onto trucks

They used to burnish a herringbone pattern onto the blades...

My dad had an "in" at the foundry.. we got new props for our boat for a nod and a wink...

Whats the dia of that screw?

Man, I'm glad I didn't write that check.