BTH are still making magnetos for the A10 ,they now have electronic advance and retard fitted so you don't need the handle bar lever anymore. They are based in Milton Keynes in England. BTH Magneto components Ltd, 15 Haythorp Close, Downhead Park, Milton Keynes, Buckinghamshire, MK159 DD. Email, weborders@bt-h.biz Thhese are brand new items that can be programmed.
Hope this will help someone.