Fixing a Harbor Freight style Arbour Press.

[Toolmaker51]

Since I have never been on a F-1 team I have never heard of a grub screw in my life. Only with the rise of world wide technical/mechanical content on You Tube have I been exposed to the term. This definition seems to indicate "set" or "grub" are interchangeable.

Good ol' Wikipedia. Reliable info, in a vast majority of subjects.
I had online college courses, one in Sociology (pointless PITA). The instructor forbade Wikipedia as resource for citation, meanwhile course book was of his own authorship. Imagine that...
Of course, I wrote first assignment with that as citation *1.
He graded it fully negative (as expected).
Immediately took up case with the institution's arbitrator. Simple question, how the professors own work (commissioned, royalties) represented a more reliable slice of public view, than voluntary - random - unsolicited - contributions that make up vast content found in Wikipedia.
Paper was regraded 99/100.
Inspiration was comedian (George Carlin?) comments on student campus demonstrations. "Why are we paying attention to students? They're STUDENTS!"