https://lh4.googleusercontent.com/-WMgi0Qnd-Gk/VCtKOXIvtHI/AAAAAAAABq8/Pz-GjAQSkWM/s800/IMG_4730.JPG
https://lh4.googleusercontent.com/-CZNnd6_eVyQ/VCtKPZOvrNI/AAAAAAAABrE/0pGoEY_DpYc/s800/IMG_4739.JPG

The slotted screw on the end is from my earlier 1941.
The middle screw is from a 1940 model year truck.
The clutch head screw is from my later 1941.

All are the same length and have the same reduced diameter unthreaded tip.