Bill H. wrote:
Luca, the thread is mentioned. 1/4"-20
x3/4" headless. 20 can only be described as course thread.
I was talking of the abbreviations NC and NF that can or cannot be read in different manuals.
Not that important,after all, and no reasonable person is surprised for possible errors in a manual.
Who cares if allen set screws where available during the war: also cross recess head screws were available during the war,and used for instance on Dodges, but are not correct on jeeps.
There is only one kind of set screw listed on WWII 1/4 ton trailer manuals and that is what should be used if 100% correct is the goal.Period.