Karahawk ring screw size?

[MyLegsAreOk]

I snapped one of the screws off the karahawk and it's on the ring. They're tiny little buggers so they don't fit in my screw cutter to measure what size they are. I'm going to go to knife parts dot com to get them I just need to know the size. Can anyone take a guess or does anyone know?

Also I think my blade is rusting or else copper rubbed off from one of the washers and it's in deep so I can't rub it out. I'll post pics when I have to get at the knife again to replace the screw.