Originally Posted by gearbasher

I was having the same trouble with a Cinelli bar/stem combo (both 26.4). I was using a torque wrench and had the torque up to 190 in/lbs. and the bars were still slipping a little each ride. I took the binder bolt out, greased the threads of bolt and the shoulder of the nut. I reassembled them and torqued them to 150 in/lbs. and they haven't slipped. So, you can give that a try.