I included measurements in the photo of various parts. The markings on it are:
Inside housing: US Pat. 4505601, PAT CAN 1986, UK Pat. 2135397 and Made In USA
Etched on 5 inch arm: 30866, although it is a bit corroded.
I'll need both left and right side mechanisms, and I have already purchased the crank handles.
I originally ordered parts 39-089 and 39-090, but the arms were too long, and I'll have to return them.
Thank you, John
