Fixing a Harbor Freight style Arbour Press.

[tonyfoale]

set screw = grub screw seems consistent, whether it's American English or British origin. Is it Continental (?) to call very small grub screws 'grains'?
Meanwhile; here, a bolt threaded full length is named "tap bolt". By 'full length', implying not those threaded to the head common in shorter increments.

I have never heard the name grains before nor tap bolt, but then I have led a sheltered life.
Except for a spell of 4 days I have never worked in a machine shop or factory environment so I have not been exposed to hearing others name things. Neither were tool names high on my mother's list of things to teach me.