Distributor points-plate and condenser screw
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
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The little screw that secures the points-plate and condenser to the distributor body is 4 mm wide × 0.7 mm thread pitch × 8 mm long.
A suitable replacement is McMaster-Carr part number 91292A108.