So why did my alternator bracket fail?
Well have a look at this picture, this was taken back when I fitted the supplied kit, do you see the small anti shake lock washers under the nyloc nuts in the centre?

Scrambler Cycle Alternator kit
Well they have both disintegrated causing the cradle to bounce around, and then the support bracket to brake, the rear washer had disappeared completely, and just half of the front one remained. I have now bolted it down firm without lock washers using just nylocks and Loctite, it is all now much firmer.
The broken barrel stud has also now been fixed, and the bike is once again back together and ready for the Rabbit rally in a couple of weeks time. That will leave me one last camp of the year, in the shape of the Moto Guzzi Club “Red Kite” camp over on the edge of Wales.