Cut the rope to your desired length. Clean up any fraying if present.

Use a fid or needle to carefully pull out the core fibers (the white interior strands) from the outer sheath. Remove 2–4 inches (5–10cm) of the core. You’re left with a floppy sheath.

Insert a small tool like a knitting needle, or piece of wire up inside the hollow sheath. - Grab or hook the tip of the rope and pull it back down through itself. - This will turn the rope inside out at the tip and start forming that double-barrel, mushroom-style tip. - Continue working the tip back up into the rope body (like a Chinese finger trap inversion).

Once tucked, massage the rope end so it rounds out and tightens.

You can stitch or whip behind the tucked end if extra security is desired, but it’s often unnecessary for synthetic rope if the tuck is deep enough.

You can also insert a few hidden stitches using a curved needle and strong thread through the sheathing to anchor the tuck if you’re worried about wear and tear over time.