So I've got this old tandem frame that takes 13/16 seatposts, which I don't have. I've got a pair of 13/16 posts, but not one for the front seat that has the stokers stem.
Does anyone know where I might be able to find one? OR, does anyone have any brilliant ideas on how I might get a stoker stem fitted onto the 13/16 seatpost? To my knowledge, these measure about 20.2mm which is about 4mm too thin for any stoker stems I've seen.
quick and dirty would be to use the longest threadless headset BMX stem you can find. BMX handlebars are 22.2 use the handlebar clamp for the seat post end. use the 1"(25.4) stem end for a handlebar. install it upside down
BTW you have half the frame builders in the USA right there in Portland it would be easy to have someone fabricate a stem.