Rear hub, speedo drive lock nut 06.0317

Guys
Rebuild rear wheel hub assy with all new parts..all going well until I tried to wind in the speedo drive lock nut (yes I know it's L/H).... it will screw in 2/3 threads and then lock up which suggests it's the wrong thread/pitch.
Screwed in the old one ...straight in no problem.Spoke to AN and they swapped it for another nut for the 72 model..... wound it in it's exactly the same
Yes I have thread gauge but I'm away on holiday touring the Lake District so I can't confirm old against new.. has anyone else encountered this issue

Thank you

Hi, is your hub the cush drive on or the bolted one , just because the PO could had fit an earlier rear wheel/hub to your 72 (cush)........! otherwise , no clue!

marinatlas said:

Hi, is your hub the cush drive on or the bolted one , just because the PO could had fit an earlier rear wheel/hub to your 72 (cush)........! otherwise , no clue!

Click to expand...

The speedo drive lock ring is the same part number (06-0317) for both bolt up and cush drive hubs.

I'll run my thread gauge and vernier over it when I get home

Ron L said:

The speedo drive lock ring is the same part number (06-0317) for both bolt up and cush drive hubs.

Click to expand...

yes but it "could " be a pre _cdo bolt on hub .......it happens to me !

yes there are 2 different threads , the early bolt up is a fine thread.

Is it a bolt-up or cush hub?

Single row bearings were mentioned in a previous post......

https://www.accessnorton.com/NortonCommando/rear-hub-spacer.28140/

.....which suggests it's a cush hub. If 'cush' as would be expected for '72 then the pre-Commando lockring (which I'd guess is 26 tpi) obviously shouldn't fit.

https://andover-norton.co.uk/en/shop-details/15202/speedo-drive-lockring
£20.34 (inc.VAT) for a replacement lockring!!!!

What's wrong with the old one that it can't be re-used?

You could use the old nut as a thread gauge on the new one.

There are a few "dings" in the old one and as it will be exposed as no angle drive is being fitted I would prefer to replace .....if the price was reasonable, this isn't reasonable so the old one will be suitably linished and coated in ACF 50