looks like a slave cylinder bleeder from an old Studebaker I used to own if it is hollow
Clutch disc drum set screw
It's a #3334 clutch hub set screw, I think.
Looks like a shifter fork shaft lock down bolt inside the shifter cover on a accessory transmission. Holds the shifter fork in place on the shaft, gets safety wired after tightening.
Looks like Dave and roger got it. That's why it looked so familiar.
The holes in the head gave it away!
I think it's the only bolt that I've seen with the cross-holes like that on a T. Any others with the cross-holes?
The flywheel to crank bolts.