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@gbj_tester
The HG spline isn't well designed for fixed use.
Any HG sprocket will fit, the wider the base the better but Halo aren't the only people who make wide-based HG sprockets
You can get 12T screw-on fixed sprockets, and lock rings which allow them to work. Phil Wood sprockets, Phil lock ring for Campag or Andel/Soma for 1.29"