FG knot
The thinnest braid-to-leader join, it slips through the guides. Demanding, but nothing holds better.
Strength 98%Difficulty: HardJoining two lines
Tying it
Step 1: Keep the braid under tension (around a knee or a rod).
Step 2: Weave the leader alternately over and under the braid, about twenty times.
Step 3: Lock the weave with two half hitches on the braid.
Step 4: Finish with three to four half hitches around both strands.
Step 5: Wet, tighten hard and trim both tag ends flush.
Always wet a knot before tightening it: dry friction burns the line and costs a good part of its strength.