below summarise the technique for fitting these loops.
Place approx 0.75" (1.5cm)
of tube over the braid
Insert the fly line
Stroke the braid back down the line
Insert the fly line approx 2" (5cm)
Pull the tube over the joint using your
thumbnail. The joint is now secure.
I always suggest using just a few drops of waterproof superglue
under the tube just before pulling it over the joint. Always trim
any excess fibres as these can tangle your leader sometimes when
casting. Keep it neat. You can also use a leader loop at the other
end of your fly line to attach it to the backing line.