Sturmey archer am hub, no snapring?

[seph]

I have an alloy shelled AM hub, which I'm finally building into a wheel. It has a sprocket fitted, which I want to remove to allow room to spread the spokes. However the hub does not appear to have a snapring holding the sprocket on, is the sprocket likely to be threaded as suggested here https://colwoodwheelworks.co.uk/sturmey ... t-problem/ and would the lock ring holding it in place be threaded like a fixed wheel lockring ? (afraid I cant upload any pics..) I'd like to know before I get too carried away trying to remove it.

If it is the case that it is threaded, is it worth replacing the driver with the more usual sturmey type?

thanks for any insights.

[seph]

Ah, thought I'd try a speculative tap with a screwdriver and the lockring un locked.

It seems I have a 12 splined lockring, how exotic!

[Brucey]

IRC the lockring is threaded, the sprocket is splined.

IIRC the AM hub can use an AW driver, so there is no real reason not to swap to a more conventional driver that uses a 3-lugged fitting. The 12-splined sprockets are getting hard to find these days.

cheers

[seph]

Ah yes, I meant 12 splined sprocket...

It's in good condition, so I'll keep it on for now. I can always swap the driver in the future if necessary.

[scottg]

The lock ring is the same as a track lock ring,
I have a Shimano Dura ace lock ring on my FC & AM hubs.

Hillary Stone has the splined cogs.