Is the headset fully in the frame? is the headtube flared? is the cup of the headset snapped off the part that goes into the frame? I don't really know what's wrong, try these, if it shows none of these, find a friend, buy him a mars bar and once he has eaten it, ask if you can borrow his headset to try in your frame, if he says no, throw it all in his face about the mars bara nd so... Hope this helped as I'm tired and it's getting late. Night all...