Knots
Loop-to-loop: line onto leader
Draft reference — pending review.
What it's for
Modern fly lines end in a welded loop; tapered leaders come with one. Joined right, the two loops nest flat like links in a chain and the connection outlasts the leader. Joined wrong — the girth hitch — one loop strangles the other and quietly saws through it, and the whole leader goes with a fish attached.
The steps
Through
Pass the leader's loop through the fly line's loop — loop through loop, nothing else yet.
Thread
Now pass the leader's other end — the whole leader, tip first — through its own loop.
Seat flat
Draw the two loops together. Done right they interlock side by side, lying flat like a reef knot — a square, symmetric little junction.
Common faults
The girth hitch
The junction looks like a noose: one loop cinched tight around the other line at a right angle. It casts fine — then one day the leader is simply gone at the loop.
Fix: A girth hitch cuts into the coating and the mono under every casting load. Undo it, and re-seat so the loops nest flat and pull in line with each other. Check the junction whenever you change leaders.
When you'll use it
- Fitting a fresh tapered leader in seconds, no knots tied at all
- Swapping whole leader setups on the water — dries to a sunk team — without cutting anything
- Checking your existing connection: flat and square is right, noose is wrong
Related
Sources & how we know this (2)
- Correct loop-to-loop: loop through loop, leader threaded through its own loop, seated flat side-by-side like a reef/square join
MidCurrent — Proper loop-to-loop connections · 2026-07-11 - Girth-hitch mis-seat as the common failure: cinched loop progressively cuts the material under casting load
Battlbox — Mastering the leader-to-flyline connection · 2026-07-11
Draft reference — pending review.