Robert -
SC Parts in the UK sells a replacement hub for 199# (sc part no 321 588), but it uses the same old studs so will be prone to failure eventually.
If you are willing to wait 6 months or so, I am in the process of machining and producing new completely redesigned hubs which will make the old BN1 axle better and more reliable than the later axles which are heavier. But you will have to be patient with me, I am very busy at work these days.
Good Luck!