Thanks for the helpful thread.
Freezing the races really helped, as well as the tip on using the old ones to bang on.
Knocking them in was the scariest part for me. Ears still pleasantly ringing from all the hammering.
Anyway, no more nasty hum in the hub and I'm sure that if those races weren't all the way home, I would have heard some horrible noises immediately.
Felt a bit of warmth at the bit of the hub that protrudes at the wheel after a 6 mile test.
Don't know if that is from the brakes because the disc was hot to the touch. Didn't have time to take the wheel off again to feel the hub itself.
Any advice on what is too hot?