It may be worth having a word with this (French) eBay seller -

http://www.ebay.co.uk/usr/artmanaurelie

I have bought New Old Stock spindles from him in the past. He may have some more. He is a reliable and helpful seller.

Thomas Wältermann in Germany (See links page) may also be able to help. I believe that he had some spindles at Beaulieu this year (or was it last year ?)

Peter thanks for your message, like you i don't want to buy my forks spindles made in India, because steel is not good.

Norton original girder forks spindles are made of EN16 or EN24T steel it's high carbon hardened steel.

Rik thanks for your message but i have bought some 16H parts to artmanaurelie and he has 1 16H fork spindle and not the others spindles, he can't help me.

I have send a message to Jake the specialist of girder forks and i have no news.

I really don't know how i can rebuilt the bike without the spindles ? I have 2 spindles ( 1 up and 1 down) the 2 other are in bad condition, 100% dead.

Laurent,
I have all 4 oversized (9/16") nos spindles and some good used (1/2") plain ones from my recent rebuilding of my forks.
Do contact me if you want.
How are you planning to overcome the worn fork holes, since norton never used bushes? What I did was to find (with lots of effort) nos oversize spindles and made bigger fork holes to fit, just like norton factory planned!
Cheers,
Kostas

If you struggle for NOS parts Ken McIntosh (manxnorton.co.nz) makes new spindles with nuts, washers etc. but unless things have changed only in 1/2" diameter.
My forks had to be bushed to bring them back to usable on std spindles.