Eric,
by the image in video you recorded and from I can see, the lower part of the yoke is not connected all the way to the straight part. On the straight part the threads have clear parts for the allen nut to come in and grip it firmly. If it is loose , and if you turn it it can make such a sound.
But , it should not have any effect on balance, I hope....
Try to turn that small allen nut all the way, stiffening the lower part of yoke to the upper.
excuse my english spelling
best regards
Milos Kodemo