Do I need to buy the light weight fan hub to match this ??. I thought this was an upgrade to the plastic fan, but I've just stripped my machine to find the hole in the fan is much bigger than the mating boss on the hub, effectively it will only be located on the three bolts (which I don't think is the right way).
Has anyone else fitted one of these ??. Looks like tomorrows flying is out the window if I need the new hub.