What do you mean by "flexes"? Forks do flex a bit, in a springy kind of way. A rattle or loose feeling is a headset issue.
Sorry should have been more specific... The whole fork pivots backwards slightly - there is no bend where anything shouldn't. Loose would describe the feeling. As you say, my suspicion is that it is a headset issue - if it is 30 years old (and likely never serviced) then I guess it needs some attention.
Sorry should have been more specific... The whole fork pivots backwards slightly - there is no bend where anything shouldn't. Loose would describe the feeling. As you say, my suspicion is that it is a headset issue - if it is 30 years old (and likely never serviced) then I guess it needs some attention.