Die cast box screws type?
I have a diecast box from the 80s where a couple of the mounting screws were troublesome to undo, I ended up drilling the heads off then undoing the remaining threaded parts using a pair of pliers. I thought that they would be 4BA but that's slightly too big, and they're not - as far as I can see - metric either. Any ideas what type and size they might be? Thanks.
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