Joined: Nov 2006
Posts: 19,810
Likes: 597
From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
I don't have one in my hands either, so I'm not sure what to tell you. I have one of these in NJ that I can look at when I get back there after the holidays.
As I recall, the B66 has springs that are bolted in, so you can disassemble the frame without having to mess with rivets. Am I right? If so, you should be able to take the nuts off the bolts at the cantle plate, and you may be able to get to the nut of the bolt you're referring to.
Reckless gluing is not a good idea, though!
If you can wait a couple weeks, I will take one of mine apart and tell you what I see. No worries there, all mine are junk frames waiting for new leather.