My 39 Chevy stake truck has one, as well as my 29 Ford Tudor. I use them to set the points. With properly maintained vehicles, I have had no need to use the hand crank otherwise. They make great conversation pieces tho. I had 2 crank hole covers for the 39, but I lost one while driving it. The one on it now is wired securely from behind to prevent any further lose.
Rick
