For the plug screws you might try a remote control (R/C) Model Hobby Shop. They have all sorts of odd ball screws and what not. At least it's another option. A local one here had the allen head set screws for the CZ trainer sights, not to horribly priced.
Thanks, I'll give that a try. I think there is a place like that in a town I'll be going to later this week.
