i just replaced the adjustable stoker stem with a 140mm 17 degree stem from 3t. a photo is below. so far, it hasn't saved much weight, because i had to use 3 shims for this setup (one for my seatpost; one to attach the stem to the seatpost; and one for the stem to the handlebars). two of the shims are pretty heavy (around 25-30 grams). also, i had cut my previous seatpost to make it lighter; the new seatpost hasn't been cut yet. so, no real weight saving so far. i'm going to try to find lighter shims and get the seatpost cut, and then i'll see how much weight savings i can get...