1973 Raleigh Grand Sports 531 Reynolds. Off CL for decent price, even checked the lugs and bb for brazing defects not uncommon with the older Raleighs. I did notice the rust at the seat tube lug and even loosened the st bolt and rotated the post to check for frozen post(difficult but not frozen) but did not take the post out, oops! It appears there was a void in the brazing then rust occurred causing a separation of the st and lug (that's headscratcher, the "flapping" st). The separation goes down just below the lug and is limited to this area. So, anyone have a solution(if possible) or direction on how to approach a repair?