I aquired an old Schick/Eversharp injector with an original pack of blades that are unopened. The outer part of the container is rusty, so I'm sure there's some rust on the blades. The question is, is there only one system for Schick injectors? Will any Schick injector package work with any Schick injector razor? I'd like to buy some blades just to give this razor a try.