I recently opened up an old electrical box with a weak ground. To fix
the ground problem I wanted to connect a ground wire to a green
grounding screw into the box.

However, the old box doesn't have any holes for 8-32 sized screws, but
only for the larger holes (for mounting?).

Questions:

A) Is there any reason why I cannot screw the grounding wire into one
of the larger holes in the box?

B) What size screws fit the larger holes?

C) Would any normal screw metal type work?


Thank you.