I know this thread is a year old, but I found it when trying to solve the problem with MY handlebars. Tri Axis installed on Spyder RT-S at dealer before taking possession, and at lowest point aren't too bad for lil' old me, but way to low for 6'4" hubby. And when we tried to raise them, nothing happened. Same problem as above, turning the low center bolt just made the handlebars 'loose', and could then could flop up and down by several inches. The problem was locking nuts that weren't locked during installation. If anyone else has this issue, remove the lower rubber cover (4 Torx screws). While holding the handlebars up as high as they will go (might be helpful to have a 2nd person) use wrenches to tighten those locking nuts all the way up. You'll know you did it right when A) the bolt is now much tighter to turn, and B) the handlebars go up and down.
Hope this helps someone else, we almost drove 6 hours to get it fixed until dealer figured out what happened and walked us through the fix.
The handlebars now work great!:yes: