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@tmevans
I have got myself a halo dj hub that I need to attend to,anyone have one of the special tools to get the lockring off? the cog is threaded but on a small thread. The details halo give are 23 x 1mm. I also would like to know where can I get a replacement cog cheaply please? the Halo ones are £20. The one it comes with is in OK condition but is like 10 or 11 teeth which won't be easier to pair with a chainring and the cranks I already have