Reference Yoshikawa, Takeo (http://216.239.57.104/search?q=cache:iQJsXhA8SSwC:www.angelfire.com/dc/1spy/Yoshikawa+Takeo+Yoshikawa&hl=en&ie=UTF-8)
... axis of the gyroscope in the Dynabee is fixed to the spinning mass and it rests in a little groove inside the wrist exerciser device, which almost completely covers the ...