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Dan, I don't think I've seen this thing either. The line drawings are and have always been poor even for parts identification, so I don't make much of the shape differences I notice.
I think Chris is looking at the block to support the rubber, but when I put new parts in, I see the block only has to provide enough surface to support the sleeve inside -- which looks like something #14 could do as well. Any lateral shove on that M8 bolt can't be offset by mere rubber.
The other thought I had, in case those things existed, but fell out long before our ownership, is #14 could be what expands the rubber. Cup shape. Just a guess from a designer's point of view.
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Art Benstein near Baltimore
I stayed up all night to see where the sun went, and then it dawned on me.
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