Fingers are made from two 36" black rubber bungie cords cut , the ones with metal hook that truckers use to secure tarps. I cut down the sides a bit leaving a 1/2" tab at the end so that when you insert them into the cap they retain the "finger". Point the tips slightly and drill your holes smaller than the width of the strips. Get the tip in and pull through with pliers. Then I ran them against sandpaper to take off the shiny spots. They grips feathers very well.
Not my design, but I copied it from someone else here.
Not my design, but I copied it from someone else here.