Take two CDC feathers and place them back to back with each other. Strip the fibres away on the stems with your thumb and index finger nails leaving a feather that is the same length as the hookshank (As shown).
Catch in the two cdc feather stems onto the hookshank, leaving a distance of two hookshank lengths from the eye to the end of feather. Trim any waste on the stems and cover the trimmed ends with thread.
Hold the end of the CDC feather with your right hand and wind the thread up the exposed CDC stems with your right hand. (This can be a bit tricky until mastered). Once at the start of the CDC feather, wind the thread back down.
Pull the two goose biots forward and secure at the eye. Trim the waste and create a neat head. Varnish the head and then take a dubbing needle or piece of velcro and pick out some of the fibres on the thorax to make the fly slightly more buggy.