If you give john holden a ring he is more than glad to help. I needed a few replacement bits (the plastic bit that the arms all connect to and the fittings and buttons to cover them after mine decided on an unscheduled flight along dungeness beach) and he sent them to me free of charge , together with instructions on how they are fitted and even a little tool to fit them! Amazing guy , very genuine and very approachable. Cant remember the number but hes in the book and in the chelmsford area of essex. Let us know how you get on.