Same as the others: I use an exacto knife to split the quill down the middle. Grind the base ( I use a drum sander in my drill press). You can also grind the sides of the quill( fat ends) to get it the same width the whole length. Cut to length desired and apply tape, the attach to shaft. A dot of glue on the leading end. I also dye my cock feather with dye from 3 Rivers. A small packet of the powder makes a gallon of dye. Pour into a enamel pan heat water and toss in 6-8 full length feathers at a time. Remove after 1 min. and let dry. Then split, grind and cut to length.