I just came across this on ebay (link below) and wondered if anyone has ever used one, and if so how good they were. Seems like a pretty foolproof way of putting an edge back on my scouts knives while on camp, as many of them turn up with knives that you'd struggle to peel a carrot with.
http://cgi.ebay.co.uk/Lansky-UNIVERSAL-KIT-Sharpening-Knives-Bushcraft-Axes_W0QQitemZ230289971336QQcmdZViewItemQQptZUK_Knives_Tools?hash=item230289971336&_trksid=p3286.c0.m14&_trkparms=72%3A1298|66%3A2|65%3A12|39%3A1|240%3A1318
(sorry i dont know how to make a live link)
http://cgi.ebay.co.uk/Lansky-UNIVERSAL-KIT-Sharpening-Knives-Bushcraft-Axes_W0QQitemZ230289971336QQcmdZViewItemQQptZUK_Knives_Tools?hash=item230289971336&_trksid=p3286.c0.m14&_trkparms=72%3A1298|66%3A2|65%3A12|39%3A1|240%3A1318
(sorry i dont know how to make a live link)