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Khamsins were produced in two types. One type just had a freewheel option, the other type had a freewheel option but also threads for a cog and lockring on the other side. For the latter type there was a metal cover included to cover up the threads on whichever side you weren't using.
Don't know any specifics about converting one, sorry :) (mount a track adapter onto the freewheel threads?)
Is it possible to convert a Khamsin disc. How?