OK, I'm learning by leaps and bounds here. I really appreciate the help. It makes more sense now that I know the opening was already lowered. So then the gooseneck would be inserted and raised up a bit in the mast...but where would that line from the gooseneck have been anchored to keep the boom down (resisting the sail and halyard pulling up)? I'll attach a couple more photos to show more.I found what I assume is the mainsheet with two blocks. I'm guessing the larger block with cam cleat attaches to the traveller on the forward cockpit sole, and the single block goes on the eye about midway on the boom. Correct? And how would the jib sheets be run back on the M17? I did find 2 separate single blocks; I'm not sure where they were used. I also have a telescoping forspar; it has what a would call a probe on one end and a clip on the other end. Gee, I'm almost ready to drop the mast again, install the halyards (I found 2), raise the mast again and hoist the sails. Then I can take real measurements for the new mast. Oh, there was also a custom whatsit in a locker (see photo). It's made from a pvc glue in coupling and two jam or V cleats; any idea what this was for?
