My dynamo was no longer supplying voltage and I had to have it overhauled. Ten years ago I had it done by Priory Magnetos, but now I've come across Ecurie35 in St Malo (France). This is Prosper Keating, who does an excellent job, keeps you very closely informed and is always available via email, SMS and phone. Even after a misunderstanding about the direction of rotation on my part, Prosper corrected it at no extra cost. Highly recommended!