Join Date: Apr 2007
Location: Carolina Clandestina
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Being clear about whether its a freewheel or cassette would help.
If its a freewheel, you need chain whips to remove the smallest cog while the freewheel is on the wheel. After removing the smallest cog, all the others will come off and you will then need spacers as you reassemble the freewheel.
If you have removed the freewheel, you might be better to just get a single speed freewheel for replacement than modify the old freewheel.