I have bought a bike and the previous owner has used a 12 speed sram eagle 11-50 cassette and removed the 13 tooth cog and replaced the 11 tooth one with what is probably a 11 tooth from a 10 speed cassette to make it work as an 11 speed. It works ok but I would prefer to just convert it to 12 speed. I can't seen to find any replacement cogs anywhere and I suspect it is because sram want to sell me a whole cassette. Is that the case or is there somewhere that sell individual cogs?
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