I wonder why brion recommend an installation on the port side, throwing tradition out the window ?
decide where to cut your exit, like was said, about a foot from other exits vertically, and make sure that the halyard from the sheave up top to where you put the exit will not rub on the rootbars or other halyards. so that means likely to the aft half of the spar, if the halyard is running down behind the root bars. I would cut the exit in about 6-8' up if there are no other restictions.
a jammer is not needed if the winch is going to be dedicated to the main halyard, but the use of one will allow the winch to be used for other lines while the main is up, and I would reccomend installing a jammer. put it up near the exit, so that it can be reached conviently but leave enough room under the jammer so that the person raising the sail can reach up and get a good grab of line and get the sail up quick.
winch and jammer will have directions that should tell you what the maximum angles of deflection they will handle for the line leading in or out of the jammer and into the winch,
the winch should be mounted at a good height for getting leverage to crank on the handle, I like to use a height of around 32-34 inches, but that all depends on the owners preference.
how do you plan to mount the winch to the mast ?
why does he not just keep the deck winches ?
the line is going to doa bend around the upper part of the exit comming out of the spar, no matter what. as long as the jammer is low enough that the line just doesn't rub on the bottom of the exit too, then you have friction at its minimum, right ? Speaking of cutting exits, smoothe and taper the exit area becasue poorly cut exits can cut through a line on a nice day on the bay, in just hours, especially with streachy line.....
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