Tie the leader or backing to the flyline:  Albright and Castwell knots

 Albright Knot: To tie the backing to the flyline or to tie together monofilaments with different diameter   from 20/100 to 50/100.

  Make an overhand loop  with the flyline (or with with the mono of the latger diameter)Put the backing (or the small diameter monofilament) through the loop and make one wrap .

Then wrap the backing BL around the Loop and itself.

 Keep wrapping around and hold the coils with your left hand.

Make 8 to 10 wraps, then put the BL end through the loop, exiting from the same side it got in.

 Push the coils to the end of the loop, Keep 5 mm loop free.

To tighten the knot, hold the 2 ends of the flyline and pull on the backing BL end. Take a plier if necessary. Pull on the backing BF, then on the BL again, the BF and the BL. Use as much force as necessary.
 .

 Cut the flyline and backing free ends

 To make a knot with  2 monofilaments
having a large difference in diameter you must double the one with the smaller diameter.

 Castwell knot:   Described par J.Castwell ( www.flyanglersonline.com) to link the floating , sinking line to the leader , this knot is so simple it is hard to believe! But it hold! Must not be used for nylon/nylon, because it would slip. 

 Make a loop A in the leader (any loop above), put the line beside.
 Take the tag end BL behind the loop and over the standing line BF  .

Put the tag end BL through loop B between the standing line BF and the end of loop A
Draw slowly on leader, tag end BL and standing line BF to tighten the knot.
 On the right, a close up before cutting the tag.  

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  Here are 2 pictures of a knot between a line and a leader. The nylon has embedded itself in the plastic coating, thus making hard for the knot to slip.
  Only to make sure, put a drop of glue on the knot!
 

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