I while back someone asked about attaching a ferro rod to a SAK. I just found this on SO.
http://www.sosakonline.com/index.php?option=com_content&task=blogcategory&id=15&Itemid=43
http://www.sosakonline.com/index.php?option=com_content&task=blogcategory&id=15&Itemid=43