Distributor spring
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
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There is a tiny little spring that pushes on the tiny little ball bearing that is used to make contact between the advance plate shaft and the main shaft that is connected to the gear. The size of this spring is 3 mm OD, 5 mm long uncompressed, 0.3 mm wire thickness.
A suitable replacement is McMaster-Carr part number 9435K11.