Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
On my 1979 swing keel, I installed zincs near the attachment points to the boat. I have a pair of pancake zincs near the cable attachment held on by bolts into holes tapped into the cast iron. My C-25 is a bit non-standard at the pivot, but something similar should work. I have four zincs bolted to the fiberglass with 10ga wiring in the bilge connecting them to the pivot hardware. Or, you could use another pair of pancake zincs on the cast iron near the pivot - but keep in mind which areas of the keel will be going in and out of the trunk when the keel is lowered and raised.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.