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I forget the Fisher BB shell ID or how that compares to the BB30 shell ID. One aspect I believe I see is that this adaptor depends of the bearing preload to hold the adaptors in the shell, unless the adaptors are also a press fit into the shell. Interesting the listing has a reference to tolerances "2. Please allow slight manual measurement deviation for the data." that makes me wonder. That and the need for O rings to insure contact. Andy
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AndrewRStewart