My 79 Hunter 30 does not have a winch for the mainsheet on the mast, which is inconvenient. I am going to buy a used winch and mount it. I assume I would drill and tap holes in the most to correspond with the holes in the bottom of the winch and use ss screws to mount it. some of the winches I have seen have as many as 6 holes in the bottom, do I need that many fasteners? I ask as I would rather not drill that many fair sized holes in the mast if I don't need to.