i just realized that i have an extra stem and set of bullhorns. i'm pretty sure that i can clamp that **** on to my seatpost, sticking backwards, and then use duct tape and other goodies to strap a bag on to this improvised rack..
unless there's a problem with clamping a stem onto a seatpost. i figure 27.2mm and 1 1/8" are close enough to try but i wonder if the seatpost is strong enough to hold it. guidance or input, anybody?