Sharing some images of the burnishing tool I use:
http://www.danica.com/flytier/law/bu...burnisher1.jpg
(Note: Centimeter rule - in inches the total length is 6")
http://www.danica.com/flytier/law/bu...burnisher2.jpg
http://www.danica.com/flytier/law/bu...burnisher3.jpg
Cheers,
Hans W