I owned an 81 C25 swing keel for 4 years and did a lot of work on the keel - replacing the cable is no biggie - and yes it is made of cast iron.
+1 to SNHOOL - the C25 class assoc forum is very active with an awesome group of owners past and present. Tap into them and you will get a flood of information.
Association Forum
+1 to SNHOOL - the C25 class assoc forum is very active with an awesome group of owners past and present. Tap into them and you will get a flood of information.
Association Forum