There are usually 1 or 2 of these on the front of the mast. Its where the spinnaker pole clips onto the mast. they are usually riveted on, so the rivets would have to be drilled out to pull it off.
If you have a picture of the hatch, let me know. email me firstname.lastname@example.org. Thanks!
I am interested in the tiller and extension, spinnaker, and genoa. What kind of deal could you make for that? Also, do you have a rudder too by any chance? email me so we can talk about some of these items. I like them all really. email@example.com