What I'm trying to do is swap out a couple sprockets from my 5-speed Atom/Maillard freewheel, and put them on my 4-speed Atom/Maillard.
These should be compatible and easily transferable, but my LBS told me today that "You can't swap sprockets off of a freewheel, because they are an integral part."
Sheldon Brown has indicated that older freewheels such as these have threaded sprockets, vs the later, splined ones.
Who is right?
One other detail: the 5-speed is french thread. The 4-speed is English thread. Is this detail consequential?

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