I had similar problems.
I cut the shaft shorter so that the "head" is up next to the mounting bracket. I installed a I-bolt under the head so that I could hold it down with a bungee cord.
I then installed a bold to the mounting bracket with a piece of heavy rubber hose on the end.
This just about eliminates any vibration. I have not been out enough to really give it a good test to see if this solved the problem I was having.
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