Originally Posted by
Carnmore
The USH 540 mount.
It's the locking mechanism which rattles rather than the mount.
I had that mounting system at first and I really hated it.
After switching to the Eazy KF system, I have been much happier and I didn't have your problem to begin with.
My advice is to change over to the EazyKF, besides fixing your issue, it is just a much better system to use.