I've dealt with this and shared my solution.
http://s248.photobucket.com/albums/gg188/biknben/?action=view¤t=vholdrmounts.flv
I suggest you guys watch the entire thing but at 1:50 I show how I dealt with the shake or jiggle in the mount.
I thought about doing that when i had the electrical tape out. I decided not as I figured it might tip off and get gummed up in the rails of the camera. But ill give that a try on Norms helmet mount.