Oh, the stem does not move...only the Handlebars. The 6mm nut is nice and tight, no twist sideways.
I can tighten the hex nut under the handlebars, and all seems tight, but it won't stay... Don't want to overtorque it, I've ...umm......accidentally twisted off/broken a few bolts on my motorcycles...
riding is fine until I lean forward to stand on the pedals, then the bars drop down....they don't twist, just drop. (Yeah, I'm pbly riding incorrectly...<G>)
Thanks
Mary