Actually, the tape works, but you have to take the two collars off first and put JUST A FEW wraps around the bar UNDER the collars.
pry the little white collars off with yourfingrnail or small screwdriver
Be carefull not to break them, they are a little dificult to pry off without them springing right back on.
Don't put but a couple wraps on, or the bar might not pop back in, a couple wraps actually does the trick
then put the collars back on where they go, and it should stay firm and not swing around. EnJOY!