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@pj_(pj)
nb: with regard to the cogs - you need a freewheel, not a fixed cog.
http://www.sjscycles.co.uk/cid/KSRCPX6680SJA48KWZDUS2MBGLC4X1Z3/product-Parent-Single-screw-on-Freewheel-1-8inch-pitch-335.htm
you might want to get a freewheel remover at the same time.