Is it the larger one (looking at the outside bottom of the atty) that takes a flat head screw driver?
In the very center?
Yea, I worked in machine shops all my working life, and always knew them as set screws.
Me too!Until a year or so ago, they were all screws to me (household type screws). Only needed to know if I needed a flat or a Phillips head screw driver.
I think they call them grub screws because they look like grub worms.