These two fittings are on the port side of the deck, by the two portholes on my 1983 CP-16. They are attached by screws w/ nuts on the inside. I don't know what these are for. There are no similar ones on the starboard side. My guess is that it is maybe to run a line up to the boom to control it while running - but that's just a guess, and I'm a total novice in this. It seems that if that's what it's for, there would be one on each side. Can anyone help me out?
(http://i140.photobucket.com/albums/r14/wolverine00xj/DSCN0620.jpg)
(http://i140.photobucket.com/albums/r14/wolverine00xj/DSCN0619.jpg)
Those are jam cleats.
Probably for either a halyard, and a jib downhaul.
Maybe for tune jib sheets.
Thanks, I should have taken a better picture and shown that there are fittings a bit farther back for the jib sheets. These are much newer than the ones above in the pic, and might have been placed there by the previous owner.