Rear drive backlash measurement tool
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
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I extracted this information from Ralf Brinkmann on the old Yahoo! Loopframe_Guzzi news group (which has now moved to Groups.io).

Photo courtesy of Ralf Brinkmann.