Wasn’t someone recently looking for a coupled tandem or adding couplers? I can’t find the thread but his looks like an incredible deal:

https://losangeles.craigslist.org/la...712017822.html

[img]blob:https://www.bikeforums.net/a00e8cfc-f200-4d1b-b007-be60d39972ff[/img]

suspension: none (rigid)
wheel size: 700C
This beautiful tandem is in excellent condition. S&S couplers are great for travel. Can break down and fit into a suitcase or large box.
SIZE: Capt: 21"/53 cm Stoker: 18"/46 cm
FRAME: Santana/Columbus MegaSize CroMoly tubset. S&S Machine couplers for easy travel.
FORK: Santana 700c CroMoly MegaSize.
Comparison weight: 36 lbs.
DRIVETRAIN: Shimano Ultegra/STR ultrawide range 27-speed.
COLOR: Violet

Paid over $5000 in 1990. Because of excellent price, you pick up or pay to ship.