Well.... if it's a spanner to hold the sprocket still while you undo a nut, then the solution is simple.
1) Get an old chain. Wrap it once sound the sprocket and clamp, tightly, the places where it touches CLOSE to the sprocket with a pair of Mole grips. You now have the sprocket TIGHTLY held and your should be able to undo/do-up the retaining nut,
2) Get a small bar about the width of your chain or slightly narrower. Drill a hole the same diameter as the 'pin' of a chain link the same distance from the end of the bar as the hole in a piece of chain is from a hole through IT. Now build a short length of chain where the LAST link is now the bar! It now resembles are short NASTY chain-WHIP! Fit the short length of chain to your speocket ONE way round to undo the nut and the other way round to do it up again.
That's the tool many of us have made for the job for years! You do NOT need different size tools for different sprockets as it adjusts itself to the sprocket, automatically.
Ian
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