I've Not Found A Common Answer Yet
I've not been able to get anyone to agree as to what the proper routing is. A lot will depend on the design of your boat, how much beam you have, where your lifelines run, and what size head sail you've got up. I've even seen differences from one boat to another that are the same manufacturer, model, and vintage. I've seen pocket cruisers with lead cars inside the life lines and outside.I've got an '85 model Mac 25. On it, with my 150 Genoa, I must run my jib sheets over the top of the lifelines, and out around the stanchions, back to the Genoa cars on my cockpit coaming.I'll usually stick with my Genoa a bit longer in higher winds than other sailors at my lake do, before I'll hank on my working jib. I've run the WJ sheets the same as my Genoa and I've also run them through a set of separate fairleads on top of the cabin roof. I've found that in lighter winds, I can get away with running the WJ with the narrower slot that comes from routing over the cabin, but in higher winds, it's a lot of work and I want it to spill more air, so it's better run the same route as my Genoa.To that end, I've got a stainless steel carbiner (designed for climbing, not the kind you use for a key chain) that my jib sheets tie to. It speeds up head-sail changes, and no, my deck and mast don't have a bunch of war scars from it banging around.