velosolo have a reasonably priced, well-made spacer kit. £10.95 You need your own lockring (I have a free spare if you are unable to cadge one) and cog ( I have a lightly used 16T DX cog you can have for a beer)
I've found that you need more than one cassette if you're breaking them up yourself anyway..
Also the SHimano DX cog is only a fiver from velosolo - you can find them for a quid less in BMX places, but there you go...
velosolo have a reasonably priced, well-made spacer kit. £10.95 You need your own lockring (I have a free spare if you are unable to cadge one) and cog ( I have a lightly used 16T DX cog you can have for a beer)
I've found that you need more than one cassette if you're breaking them up yourself anyway..
Also the SHimano DX cog is only a fiver from velosolo - you can find them for a quid less in BMX places, but there you go...
^ velosolo no affiliation etc. etc.