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The Blood Knot - Fishing Knots
The Blood Knot
The blood knot is used to join together two lines of equal diameter. It
is commonly used to extend a leader, especially when flyfishing. When
using a tapered leader on a fly line, you can extend its life by tying
on extra tippet when the most narrow part of the tapered leader has been
used up or broken off.
Here is how to tie the Blood Knot:
-

Take the two lines' ends and tie a simple overhand knot (which will
be clipped off later). Then tighten to combine the two lines into one.
-

Form a loop where the two lines meet, with the overhand knot in the
loop. Pull one side of the loop down and begin taking turns with it
around the standing line. Keep point where turns are made open so
turns gather equally on each side.
-

After eight to ten turns, reach through center opening and pull
remaining loop (and overhand knot) through. Keep finger in this loop
so it will not spring back. Hold loop with teeth and pull both ends
of line, making turns gather on either side of loop.
-

Set knot by pulling lines tightly as possible. Tightening coils will
make loop stand out perpendicular to line. Then clip off the loop and
overhand knot close to the newly formed knot.