Bend a loop in the tag end of the heavier monofilament and hold
between thumb and forefinger of left hand. Insert the tag end of the
lighter monofilament through loop from the top. Pull the standing
part of the heavy mono and the standing part of the light mono.
Slip tag end of lighter monofilament under your left thumb and pinch
it tightly against the heavier strands of the loop. Wrap the first
turn of the lighter monofilament over itself and continue wrapping
toward the round end of the loop. Take at least 12 turns with the
lighter monofilament around all three strands.
Insert tag end of the lighter monofilament through end of the loop
from the bottom. It must enter and leave the loop on the same side.
With the thumb and forefinger of the left hand, slide the coils of
the lighter monofilament toward the end of the loop, stop 1/8" from
end of loop. Using pliers, pull the tag end of the lighter mono tight
to keep the coils from the slipping off the loop.
With your left hand still holding the heavier mono, pull on the
standing part of the lighter mono. Pull the tag end of the lighter
mono and the standing part a second time.