Margaret from London writes that she has just picked up a circa-1920s English "mystery bike" that she plans to fix up and get working again. From Margaret's blog:"This is a circa 1920s bike that I'm thinking of buying and fixing up. It's in fairly rag order, but the bits that are most important are still sound. The wheels (possibly including rims) and chain will definitely need replacing, but that is necessary in a lot newer bikes than this one! Look at the brake system, it's amazing! They are called rod brakes, and it's still possible to get brake blocks and everything for them. The bike is...