Thanks for all the tips. The smallest at ACE and Hobby Lobby is 4-40. Have asked Richard about drive screws and Marine Engine about omc 0301992. If all else fails I will tap.
SkyCraft in Orlando, FL stocks millions of aircraft surplus screws, rivets, fasteners and such.
Their online catalog does not fully describe this place !! their inventory changes daily.
a phone call and they will ship that day for anything you need. http://www.skycraftsurplus.com/