Run the thread down the hookshank securing in a length of oval silver tinsel on the way. Try and keep the tinsel on the underside of the hookshank when tying it in. Stop the thread at a position opposite the barb.
Take a small pinch of black seals fur and dub to the thread until you have a thin rope. (Its always best to apply not enough dubbing than too much, you can always double the windings to make up the bulk).
Wind the hackle down the hookshank in open and even turns. When you reach the lower end of the hookshank ie. Where the tinsel is tied in. Take hold of the cock hackle with your left hand using finger and thumb or hackle pliers and hold the oval tinsel with your right hand. Keep the hackle taught horizontally and wind a rib with the tinsel back up the hookshank trapping the palmered hackle in as you go. It helps if you move the tinsel from side to side as you wind on the rib, this prevents having as many hackle fibres trapped under the winding. If you still find that too many hackle fibres are trapped , just use a dubbing needle to pick the trapped fibres out.