hi mike, no answers but then this an a7/10 forum!
Things have moved on, I found someone who had a large stock of old parts and after hunting through ariel and triumph stuff I came with e a complete wheel and brake with different size spoke flanges (larger flange is on the drive side, smaller on non drive side), which now Ive got it home I am increasingly convinced is either from the bsa b20/21/23/24/25 range or another brand of bike. Would be great if anyone could confirm what it is.
But the good news is I also picked a hub that looks like a b31 rigid hub eg 2 spoke flanges the same size, as picured in my earlier post, and it has a riveted on brake hub, but it has slots for a rear wheel speedo drive which is odd for a b31 age bike, and it needs a new sprocket and bearing housing repair, obviously also rims and spokes.
if you have a pic or sizes of a b31 hub that would set my mind at rest that I have found the right one.
Ive given the hub with same size spoke flanges o a local engineer to fix up but would like to hear from anyone who has fitted a new sprocket teeth to the riveted on hub? He has done it before but was undecided on whether to try to use small screws to fit a slightly larger sprocket on, 44 teeth versus the std 42, or weld a 42 tooth on and risk distorting the drum.
Ive heard some people perfrom a similar repair to crinkle hub wheels S fitted to a plunger a10 even though new drums/sprockets are available for those?
The b20 wheels and hubs, pictured below, and if thats what they are, I will try to find a home for in due course.....