the various uses of these feathers are found in a wee red book called "lets fish the clyde" which is as rare as hobby horse keech
the best dressing for these feathers are as follows
hook size 14,16 b170 med trout
silk pearsals yellow dulled with rosit (cobblers wax)
hackle small black hen (best quality possible)
wing hen black bird (crucial this must be from secondry feather quills they are more softer than primaries secodaries can be found apprx 4 feathers from 1st
i use 1 slip from right and 1 slip from left tie in with pinch and loop then tie in hackle front of wing approx 1 and half tirns tie in and finish neat head)

body sop thread so that it stops at wher hook point is adjacent and keep as neat and sparse as possible this little flea is deadly all season particular on sunny days