Zorki and Fed screw size's

[Bob L]

Does anyone know what some of the screw size's used on both Zorki's and Fed cameras are, example would be like the screw around the eye cup on a Fed 3 or the screw on the synch. dial on a zorki.
I know I can get screws from Oleg, but don't want to have to send to russia for a few screws.
I know there not 3-48 or 2-56 so must be some metric thread.