Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Looking at that pic Ted it's possible the rear brake was binding because I can't see a return spring, if you press the brake lever down it's probably just going to stay down and due to the adjuster bolt holding it down it may have been binding all the time. If you intend to replace the chrome points cover let me know, I have a few NOS ones.
I've spent probably a total of 4 hours over 5 days in 30 minute bursts looking for a part that was never there.The only positive is I did not loose it !!
I have a brake spring off something I can't recognise, came with a job lot of 550 parts but there were 400 parts and even Kwack parts mixed in so it could be off anything. It's the same gauge of wire as the OE 500 spring, I could see if I could copy mine if your willing to wait Ted, can't promise it will be any good but I'm willing to try.