the ring IS the spring on this, it pushes down on the pawls to keep them up in the teeth of the hub, without the ring, the pawls just lie flat and do nothing......
This is the first time I've seen a Nuke Proof rear hub that doesn't have a Shimano free-hub.
Any chance you can post a pic of the hub interface for the free-hub?
All the Nuke Proof hubs I have encountered over the years had Shimano free-hubs. (very easy and cheap to replace).
Sane here until I bought a nos one a while back. It's still unused as the decal didn't match the front (yellow not gold) plus I wondered about replacement parts. Would be interesting to see how it all goes together.
I don't know the exact sizes of these, but there are several ones available as spare parts.
Googled 'pawl spring', wireform c-clip' and 'pawl clip'...Turned up around 10 that looked likely candidates...Somewhere to start from at least:
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