Originally Posted by Kayce

To remove certain cogs from your freewheel, first step remount it back on the wheel. Then get two chainwhips(both 3/32" pitch, not track chainwhips) Put one on one of the larger cogs and hold tight. Put the other one on the smallest cog and twist counter clockwise. It will unthread. You might have to unthread the second smallest cog too. Now take a Digital Caliper and measure hyper acuratly the size of all the spacers and cogs that exist on the freewheel. That is the same amount your stack of spacers and one cog that you are going to use. It will take some reassembling and playing around to find the right chainline, but it always needs to be that thickness.