I have not seen a set screw on a master cylinder. Now, on my 38, there is a tapped hole where the brake light pressure switch mounts. Does your master have a pressure switch? If so maybe they protected the hole with a screw.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!