I just reviewed the section on best practices again.
Are you guys using a gob of RTV at a point near the center of the bolt or is
there a rubber grommet available specifically for this purpose.
My bolts had some type of rubber looking substance on some of the bolts (not
all) but they were much worn so I removed it during cleaning.

Jay

Put a spiral of red  RTV all along the tension bolt.

This damps the vibration and prevents the bolt from
fatiguing at the root of the threads where it screws
into the front housing.

Paul Lamar