Here is an image of the cylinder out of my 42 GI. This one was made by Hercules. Note the sheet metal cover held by 2 cap screws on the top rear part of the housing (barely seen in the image). I think all of the manufactures at the time used an internal reservoir design.

[img]http://www.surfacezero.com/g503/data/3285/medium/IMG_7491.JPG[/img]


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures