I just had a customer bring me a very nice 531 Windsor which he bought new in the late 70's ( full Suntour Cyclone). He had the bike to a shop about a year ago to switch from the original drop bars to a set of North Roads ( he's in his late 70's now) & to have the headset serviced. They told him he needed a new headset & stem to make it work right ( Red Flag on the headset should have told him to stop right there) and so he agreed for them to do the work. Fast forward a year when he tells me the bike won't steer right and asked if I would check it out, sure no problem I tell him bring it in. What I found was the headsets lower cup not completely seated against the head tube and that they split the amount of bearings between the top & bottom to get it to turn ( so half were missing altogether ) and then the stem they installed was not a 22.2 dia but a 21.1 dia stem which had the wet noodle feeling. I had a stem shim and installed it along with a new Hatta headset and he was very happy with the job and couldn't believe what the other shop had done, he took the headset and was going back to the other shop to voice his complaint at what I had found.