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@harv4130
that planet x one is a cog to fit on a block type freewheel hub with spacers to make a single speed- i.e NOT screw on fixed hub with a locking ring. 19t seem to be very popular at the mo but I managed to get one from here also keep an eye on e-bay as they turn up now and again, if not surley so a nice one if you have to buy new.
Hope this helps
Harv