Etek,
I do appreciate the response, but I think it has a spring. I did locate the rachet, or pawl, piece. It is designed to make contact with the bottom of the bolt that runs thru the two parallel pieces that make up the shaft of the handle. The pawl has a scallop with 3 large and distinct indents for different positions of vent opening. While I have not located the/a spring (haven't yet looked), I think the idea is that the spring connects from the end of the pawl piece to a hole above and available on the dash. The handle assembly is designed to be mounted either right or left, and there are two holes for the spring.
Thanks,
Gary
