An eye splice keeps the strength a knot throws away

Quick answer: A splice can't be stronger than the rope. Nothing joined to a rope can. But a good one gives back most of what a knot takes, and the rope usually gives out somewhere other than the splice. For a loop in the end of three-strand rope, make an eye splice: unlay the strands, tuck each one under the standing part against the lay, then keep tucking until you've made at least five full rounds.

The claim you'll hear is that a splice is stronger than the rope. It isn't, and anybody selling you that's selling you something. Every knot bends the rope hard around itself, and the bend is where the damage happens. A knot can cost you close to half the rope's strength. A splice leaves the fibers running mostly straight, so you lose a little instead.

That's reason enough to learn it. Dock lines, tie-downs, a gate rope, a hay rope, a clothesline that carries more than clothes: all of them are better with a spliced eye than with a bowline. (If you haven't got the bowline down yet, start with six knots and the order to learn them in. You'll still want it.)

Safety, before you cut anything

A splice you made at your kitchen table doesn't belong in anything that holds a person. No climbing, no fall protection, no overhead lifting, no rigging a swing from a tree limb on the strength of your first attempt. Life-safety rope gets bought finished, from people who test it and stand behind it. Same rule as the wiring jobs worth doing yourself and the ones that aren't: know where your skill stops and the professionals start.

Three more things:

• Cut away from your hand. You'll be working a knife near the strands you're holding. Put the blade on the side of the rope away from your fingers.
• Melted nylon sticks and burns. When you seal the ends, work outdoors or near an open window, let the end cool before you touch it, and keep the lighter away from the rest of the rope.
• Stand clear of loaded rope. Under heavy load, a failing line snaps back. Towing and winching are the usual places it happens. Don't stand in line with it.

What you need

• Three-strand twisted rope. Half-inch nylon or polyester is a good size to learn on, because the strands are thick enough to see what you're doing.
• A fid. A sturdy screwdriver with a smooth shaft works if you don't own one, but a fid is cheap and does the job better.
• Tape (electrical or masking), a sharp knife, and a lighter or hot knife for sealing.
• Scrap rope. Practice on a six-foot piece first. You'll ruin the first one, and that's fine.

Step 1: Tape and unlay

Wrap tape tightly around the rope about eight inches from the end for half-inch line. That's your stopping point, and it keeps the strands from unraveling past where you want them. Then tape or melt the tip of each strand so it can't fray while you work.

Unlay the three strands back to the tape. They'll want to curl. Let them.

Step 2: Decide the eye and lay it down

Bend the rope to form the loop you want. Remember it'll be a little smaller once it's finished and loaded. For a dock line that goes over a piling, make the eye bigger than looks necessary.

Bring the unlaid end back against the standing part so the taped point sits right where the eye ends. The three loose strands now lie across the standing part, fanned out.

Step 3: The first three tucks

This is the step where people quit, so go slowly.

First tuck. Take the middle strand. Open a gap in the standing part by untwisting it a hair with your fid, then push the strand through that gap, under one strand of the standing part. Pull it snug. That untwisting motion is what "against the lay" means. If the gap opens easily, you're doing it right.

Second tuck. Take the strand next to it. It goes over the standing-part strand the first one went under, then under the next strand along. Same direction, same untwist. Pull snug.

Third tuck. Turn the whole thing over. One loose strand is left, and one standing-part strand has nothing under it yet. Push the last strand under that one. It's the same direction as the first two, even though it feels backward from this side.

Now check your work. Each of the three standing-part strands should have exactly one loose strand coming out from under it. If one has two and another has none, pull it out and redo it. A bad first round makes every round after it wrong.

Step 4: Tuck, tuck, tuck

From here it's a rhythm. Each strand goes over the one standing strand next to it and under the following one, against the lay, then gets pulled snug. Do all three strands, and that's one round. Make at least five rounds in nylon or polyester. Slick synthetics need the extra grip. Check what your rope's maker recommends, because some call for more.

Pull every tuck tight as you go. A loose tuck in round two shows up as a floppy splice in round five.

You'll notice something halfway through. The splice starts to look like the rope itself, strands spiraling in the same direction, as if the rope had grown a second branch. That's the sign you've got it right.

Step 5: Finish

Don't taper the splice until all five full rounds are done. Then, if you want it slimmer to pass through a block or a hole, cut away about a third of the fibers from each strand and tuck once more. Stop there. The full tucks carry the load. The taper is cosmetic.

Roll the splice underfoot on a hard floor to bed the strands. Pull hard on the eye with a helper or a fixed post. It'll tighten, and a bit of the tail may creep, so trim the strand ends to about an inch and seal them with the flame. Don't melt the strands down to nothing. A short, sealed tail is the safeguard against the splice slowly working loose.

Wait until the melted ends have cooled before you handle the splice.

Where it goes wrong

• Wrong rope. This method is for three-strand twisted rope. Braided line and the ultra-slick synthetics take different splices. Don't improvise on them.
• Too few tucks. Three feels like enough. In nylon, it isn't.
• Splicing rope that's already tired. If the line is sun-faded, stiff, or fuzzy from wear, a new splice won't fix that. Replace it.
• Trusting it too fast. Load your first splices gently, on low-stakes jobs, before you give one a real one.

If you borrowed somebody's fid to learn this, return it clean and put a finished eye splice on a spare line for them. They'll know what it means.

Make ten of these on scrap before you trust one. By the tenth, you'll have a loop in your hands that no knot can match, and the rest of the rope will be the weakest thing in it.