I have heard of people using fixed cogs on normal hubs with bottom bracket lockrings on there.
Im not wanting to do stunts on the bike, But dont want it to be undoing itself. Is it ok to use it like that? Ive got some SA screw on sprockets that I was going to try on a Maillard hub that Ive built onto a steel 27" rim. I respaced it, and redished it so the threaded part is near the drop out.

Anyway. I went to the second hand bike shop. I got a mint condition Hercules Balmoral 3 speed roadster, in green. I mentioned my hercules before. There was a ladies Balmoral there to, it matched, but was rusty. I got a Dawes touring bike. Small frame with okish parts on it. Large flange hubs on 27" alloys. A Raliegh Explorer. I think thats what it said. A 3 speed roadster with a humped top tube, like my gold bike. But this has 26" wheels. Well a front one anyway. I got a ladies Royal Enfeild 3 speed roadster for spares. I checked the wheels for corrosion. 74 9 date. They will fit on my Explorer. I got a Raleigh ladies Clubman mixte road bike. Its a 531 frame with Campag gears. I will use the parts on the Dawes.
That came to £50 for the lot. I took them to my work. I stripped the mudguards and wheels from the Royal Enfeild and the Explorer. I got those parts back on the bus. The frames will get brought back in my folding bikes bag. As its big enough for a normal frame.