I have recently put together a skip-find Raleigh Routier.. All pretty good so far. But. The derailleur hanger "shares" the rear drop-out, this seems not to allow enough room for the wheel to sit properly and securely in, and so when I apply pressure on the pedals, the wheel shifts to rub against the frame... This does not seem right or safe.. any tips please? Would there have been a "blocking spacer" type thingy on the non-drive side to stop this?