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I'll go look in the box in the shed when I take the bins out. Might have one. Can't remember if I bought more than one when I bought my PowerTap Track hub.
Checking my records I bought mine from Sideways Cycles back in 2016.
http://www.sidewayscycles.co.uk/products/index.php?id=821&clid=12
It might still be going as there's a note about operating through Covid-19 (although it's dated 2017 some time but I guess that's just the clock that's wrong on the blogging software). Looking back I see I had to email them (Tim) to find out what stock they had, there was nothing listed on the site.
You can usually also find them on eBay.
Anyone has a used and worn WI splined track cog going spare?