On my new commuter I elected to use a threadless system, with more modern parts. Bought the VO "tall stack" threadless stem. My bars were 26.0mm, so I had to shim them to make it work. First hill it started creaking. Greased the stem clamp bolts, still creaked. Bought some 31.8mm bars, still creaked. Applied some carbon-assembly grit paste to the bar/clamp areas, less creaking but still some. Should I locktite the clamp bolts instead of grease? If the clamp bolts are alloy, would switching to steel bolts help? Try another stem? Get used to the creak?