I use barcons on one of my bikes and had the same problem. Lock-tite solved it.cydswipe said:I got my Dura Ace 9speed bar end shifters mounted to my TT bars and have a problem. The shifting works great for a bit, then the screw comes loose on the FD shifter, left handed lever. The looseness won't allow shifting out of the smallest ring. If I re-tighten the screw all is well. Do I need to apply some lock-tite or something to keep it held on? Any suggestions?