I have a couple of 503cx with different lens, what I have to do during long stop periods to preserve their efficiency?
Store them on B, uncocked, and pull them out and exercise the shutters every now and then. Every one of my friends who has a Hassy has had sticky shutters after not using them for long periods. Don't ask me why, but the problem goes away with exercise.
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."