That is more complicated than necessary for a set of spars. Rope will get the job done and going thru the car windows is complete overkill unless you cannot tie a square knot. Some people use bungee cords and have never had a problem, but rope is safer I think.Well, there is the concern of losing your rig through someone else’s windshield! Safety first, always. I would use a ratchet strap or two. Go around the rig and through your car windows on either side, effectively strapping it to the car. A trucker’s hitch is also a great knot to learn. YouTube has several videos. It will cinch down tight and never come loose, then is untied in a second when you’re home.
Hatchet Hitch
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Will Knot, informally known as the Bill Knot
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All featured in Why Knot: Skipper's Guide to Small Boat Knots, which also covers all of the knots we use on our Sunfish.
Damn, Signal Charlie, those are some impressive clusterf... er... I mean knots, LOL.
Hey, OP, when you get around to storing your spars at home, those half-rectangular, plubber-coated storage hooks at Home Depot work well for storing spars & sail, or you can build a simple wooden wall rack at a convenient height so your gear is off the ground, and less likely to be infested with bugs & critters.
A separate & equally simple wooden drying rack works great to dry out lines after rinsing, just tack a piece of wood up where there's breeze or ventilation... I put mine between two posts in the old carport, far enough under cover to be out of the sun. Line lasts longer that way... less solar abuse, aye?
Like most have mentioned it’s pretty staight forward. Being in construction I often have to lash equipment or materials to my truck.
In this case I’d be sure to lash the spars together first, then strap/tie them to each of the 2 roof racks. At this point side to side movement should be taken care of, as for front to back I’d run a piece of line through an end cap to the roof rack, one front one back, this should take care of movement in this direction, that would be for a long haul, for a shorter trip you could use the gooseneck to your advantage once lashed to the roof racks tie a line to the gooseneck to the front rack, obviously this will stop forward motion. Barring any hole shots I’d think you’d be fine as it wont slide back if your lashed tight and the gooseneck should stop it from sliding of the rack!!!
Good luck
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