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An isolation hiem doesn't have the "trapped ball" steel pivot point, instead it looks.... well, sort of like the end of a shock absorber ... with the steel sleeve the bolt goes through, then a rubber bushing, then a steel outer ring/housing with a threaded post like a regular hiem. Morrison has them in his 2003 catalog for $32.50 each in 3/4" and 5/8" (stainless steel).
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