For those interested in fan birds, Sally Nye, one of the leading exponents of fan birds, has posted a video on You Tube about 'riving'.
It is at:
http://www.youtube.com/watch?v=OwO9AWhsOeM
You can find other sources at:
http://www.bushcraftuk.com/forum/showthread.php?t=83949
It is at:
http://www.youtube.com/watch?v=OwO9AWhsOeM
You can find other sources at:
http://www.bushcraftuk.com/forum/showthread.php?t=83949