How to Use a Marlinspike on Deck and Ashore

A marlinspike earns its place in a sailor’s kit the first time a wet, hard-set knot refuses to give way. This simple tapered tool is not a decoration for a rope display or a costume accessory. It is working gear for opening strands, loosening knots, and laying up rope properly. Knowing how to use a marlinspike means working with line instead of fighting it with a knife, screwdriver, or bare hands.

A good marlinspike belongs alongside a rigging knife, sail palm, and a coil of honest rope in a proper ditty bag. Whether you are tending dock lines, putting an eye splice in three-strand line, or freeing a stubborn bowline after a hard blow, the principle remains the same: use the taper to create room without cutting or crushing the rope.

Know the Working End of the Tool

A traditional marlinspike has a smooth, tapered point with a rounded butt or sometimes a shackler or an eye for a lanyard. Most are stainless steel, brass, or hardwood. Stainless steel is the usual choice for serious rigging work because it will stand up to hard line and repeated use. Brass resists corrosion well and has the right old-school look, though it can be softer. Wood is kind to rope and useful for lighter work, but it is not the tool for forcing apart a weathered hawser.

The point should be tapered, not needle-sharp. A marlinspike is meant to separate fibers and strands, not stab through them. If the tip is burred, rusty, or sharp enough to snag yarns, dress it with fine abrasive paper and wipe it down with a little oil. A rough spike can damage the very line you are trying to preserve.

For most aboard-boat work, choose a spike that fills the hand without feeling like a belaying pin. A small spike is handy for light lashing, whipping, and paracord-sized line. A larger one gives better leverage in dock line, anchor rode, and traditional three-strand rope. Match the tool to the rope. Too small a spike will not open the lay cleanly; too large a one can distort or chafe the strands.

How to Use a Marlinspike to Open a Knot

The most common job is breaking a jammed knot loose. Start by taking all load off the line. This matters. Never drive a marlinspike into a knot that is holding a boat, a sail, a person, or any other kind of load. Ease the line first, secure the vessel, and make sure there is no stored tension waiting to turn the spike into a projectile.

Look for the bight or turn that was made last. On a bowline, for example, the collar and the turn around the standing part are usually the places to begin. Insert the point of the spike gently between the rope parts. Work it with a twisting motion, widening the gap a little at a time. Do not pry hard like you are opening a paint can. The goal is to relieve compression in the knot, then use your fingers to pull the loosened section free.

With wet nylon dock line, patience beats brute force. Nylon compresses under load and often tightens further as it dries. Work around the knot from several angles rather than forcing one spot. If the line is gritty with sand or salt, rinse it when practical. A clean line is easier to work and lasts longer.

A marlinspike is especially useful on knots tied in laid rope, where the individual strands can be eased apart. Braided line requires a lighter hand. Insert the spike only enough to create a small opening, because aggressive levering can snag the braid’s cover or damage the core.

Use the Spike When Making a Splice

Traditional marlinspike seamanship comes alive in splicing. A properly made eye splice, back splice, or short splice holds more character and usually retains more useful strength than a bulky knot. The spike is what allows you to open the lay of the standing part without tearing up the rope.

For a three-strand eye splice, first unlay the working end far enough to form the eye and tape or seize the strand ends if the rope wants to unravel. Lay the standing part in its natural twist. Insert the marlinspike under the first strand where the tuck will go, following the lay of the rope rather than crossing against it. Rotate the spike just enough to open a passage.

Remove the spike and tuck the appropriate working strand through that opening. Then move to the next strand in sequence. The tool creates the fair lead; it should not drag the strand through by force. If a tuck requires a wrestling match, stop and check your sequence. A clean splice follows the rope’s own structure.

After each round of tucks, snug the strands by hand. Keep the eye from twisting and keep the splice even. Most three-strand splices need several full tucks, with the exact number depending on rope size, material, and the job. Synthetic rope often benefits from tapered ends and careful finishing to reduce bulk. Natural fiber calls for traditional serving, whipping, or seizing where the job demands it.

The same method applies to a back splice at the end of a line. The marlinspike opens each lay so the strands can be tucked back cleanly. Done right, the finished end is compact, useful, and far more seaworthy than a melted lump of synthetic line.

Working Modern Rope Versus Traditional Line

A marlinspike is most at home in three-strand twisted rope, especially genuine New England rope and other quality laid line. The individual strands are visible, and the tool’s purpose is straightforward. With double braid, hollow braid, or high-modulus rope, the work changes. Those constructions often call for purpose-made fids, tubular tools, or manufacturer-specific splicing instructions.

That does not make the marlinspike obsolete. It remains useful for loosening knots, opening small passageways, picking out stitching, and handling light cordage. But do not use it as a substitute for the correct fid when splicing critical modern running rigging. High-load lines deserve the right tools, the right measurements, and no guesswork.

Marlinspike Safety Is Plain Seamanship

The danger is not complicated: a spike can slip, and line can release suddenly. Keep the point angled away from your palm, thigh, and anyone working beside you. Brace the rope against a firm surface when possible, rather than holding a tight knot in one hand and driving the spike toward it with the other.

Do not put a cheater bar on the handle. Do not hammer a marlinspike into loaded rope. And do not use one as an improvised ice pick, chisel, or screwdriver. A good spike will last for years if used for ropework, but abuse can bend the shaft or create a burr that ruins line.

A proper lanyard is worth having, particularly aloft, on a pitching deck, or over deep water. Secure it to your belt, work bag, or wrist with enough length to use the tool freely. There is no romance in watching a fine spike go over the side because it rolled off a cabin top.

After use, rinse salt away, dry the tool, and apply a light coat of oil to steel. Keep it in a sheath, a canvas tool roll, or a dedicated pocket in your seabag. Loose tools find bare feet and varnished soles with remarkable accuracy.

A Tool That Teaches You to Read Rope

Working with a marlinspike slows you down in the right way. You start to see how a knot loads, where a strand lies, and why one eye splice beds fair while another looks like it was tied in a hurry at the dock. That knowledge carries over to every line aboard, from a simple heaving line to a serious mooring pendant.

SHIPCANVAS has always favored the real thing: tools made for ropework, line made to work, and traditional skills that still earn their keep. Keep a marlinspike where you can reach it, use it with restraint, and let the rope show you where it wants to go.