If usually the ES only allows rotation on 1 axis, shouldnt the metal casing be rotating around the actual bolt? I would think as long as you use antiseize you shouldnt have too much of a binding issue.
I see rubber as more of an issue when the bolt seizes, such as the LCA. Those were torn because the bolt was seized to the casing, and the up/down movement was binding in the rubber.
I do reccommend ES LCA bushings, they work great.
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