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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@gbj_tester
The HG spline was designed to be made from steel and driven only one way. The load reversal of fixed gear use highlights that it provides provides plenty of backlash, which will be destructive pretty quickly. In fact, all sliding fit splines will have some backlash, although you can reduce it by making the mating parts precisely to minimise the clearances, and then reduce the negative consequences by making the flanks larger and more steeply angles (closer to radial)
Given the size of that belt pulley, it seems that 6-bolt ISO would be a far more sensible way to attach it to the hub, if the aim is to have a drive which can be fitted to cheap and easily available hubs. The properly tarty way to join a sprocket to a hub is with a Hirth joint, but that might look a bit pricey even to people who are ready to waste their money on belt drives :-)