I know this is a really late response but I'm a month behind on the forum. I believe all the comments about the rod preventing the deck
from lifting, delaminating, etc are correct. I also own a 1979 Endeavour
37 A plan, and what is unusual about them is the A plan doesn't have a main bulkhead anywhere near the mast
. No V berth and a forward dinette. My boat had a metal fitting attached to the top of the rod, on the cabin
top, that is used to attach the factory installed boom vang
. If you search the web, you'll see most of the E-37's have their vang attached there. If you havent already I suggest you look into the Endeavour
Owner's Forum. Lots of useful info there. By the way, where was the leak?