I'm having trouble with an S3C hub on a Raleigh Space Rider
I'm overhauling for my daughter. In the gear ring assembly, one of
the pawls was loose--the drift pin that held it in place was broken--
so I need to find the correct drift pin. According to the
instructions at https://www.sheldonbrown.com/sturmey-archer/s3c.html ,
the gear ring pawls should be riveted in place, and indeed the planet
cage pawls look riveted in place. Any idea where I can get the
correct rivets or drift pins to fix this hub? I tried the local hardware store, but the pins there are too big or too small...

Geez, I just got rid of a bunch of SA coaster brake parts I wasn't ever going to use. As the local hardware store was a bust, I would suggest Mcmaster-Carr, Grainger, or Metric and Multi-Standard(a good source for Whitworth wrenches and hardware). As a cheap fix, I'd look at various size drill bits(/32 and /64 sizes should get you into the ballpark) and sacrifice one for Queen and Country.

Are the pawls similar to ones found in an AW?
Should be plenty of those to rob.

Ahhhh!

What would hold it in place?

It's not the pawls; it's the pins, and no, not the same as an AW.

If you go the drill bit route, I'd use a dremel with a cutoff wheel and cut a slot about an eighth deep on each end. Spread one end slightly, insert the pin through the pawl, then spread the other end. It's a kludge, but it will work.

UPDATE:

I tried this over the weekend--I bought a 9/64" drill bit-- and it worked perfectly. My daughter is still a bit too small for the bike, but maybe next year.
Pics forthcoming.

Thanks Bikamper; hope to see you this weekend.

Here's my big girl with her big bike:



A bit too big for her, but she rode it up and down the alley.

That's a great picture! The joy on her face with her new bike is so obvious.

Will you be at Lake Pepin this weekend?

Yes I will.



My daughter wants to come, too. Maybe in a few years.
Poor kid--we're turning her into an English Bike / C&V nerd.

Good on ya.
Yup, I'll be there and will have more of the clan along this time. Confidence is high that daughter will NOT have a self destructing hub this trip and her hubby is along for the ride this time as well. Confidence ain't so high that he'll be riding back to Red Wing on Sunday. He'll most likely keep Mrs. B and the Dog Brothers company at the pop-up.

I remember last year. I was thinking of bringing along a spare rear wheel just in case someone needs one.

Corky won't forget. Ian said it sounded like a gunshot. I ended up ditching the guts and installing an NOS assembly. Corky had this pic blown up and framed for Fathers Day last year.