Joined: Nov 2010
Posts: 15,315
Likes: 903
From: Tixkokob, Yucatán, México
Bikes: 79 Trek 930, 80 Trek 414, 84 Schwinn Letour Luxe (coupled), 92 Schwinn Paramount PDG 5
Gremlins? You might check with the folding bikes forum; much more experience over there.
I simply can't imagine what it would take to pull the seat rail out of its socket. I've tried putting them back in, and i agree, it appears to be impossible.
Good luck