changing the rear cog involves removing the lockring (either using a proper tool or a hammer and screwdriver) and then using a chainwhip to unscrew the cog. Its a straightforward job if you have the tools. The reverse applies for installation.
@Hovis started
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changing the rear cog involves removing the lockring (either using a proper tool or a hammer and screwdriver) and then using a chainwhip to unscrew the cog. Its a straightforward job if you have the tools. The reverse applies for installation.