It is really too bad that freewheel cogs were mostly threaded not splined. Splined cogs would be easier to manufacture.
Zeus was ahead of the game in this area: all the cogs were splined, with the same spline pattern, except the final cog, which was threaded and held the rest in place. No spacers were needed, as the cogs were machined to provide the intended clearance. And the bodies could be removed from the hubs using either the then-ubiquitous Regina 2-prong remover, or the superior splined remover later adopted by Regina, Everest, Atom, etc.