Take whatever knife you regularly carry in the wilderness and check the spine on it. If it is rounded over or doesn’t have a good 90 degree edge on it, modify it. Of course this is only if you are willing to make adjustments to your knife. Well wearing proper eye and hand protection you can either use a file, belt sander or grinder to put I nice 90 degree angle on the spine of your knife. With the adjustment to your knife done, you’ll now be able to use a ferocerium rod more efficiently and you can now use the spine of your knife to make fuss by running the spine of your modified knife down certain types of wood. The fuss will just make it that much easier to start a fire. Hope this was informational and someone finds this helpful. Thanks for reading! What modifications have you made to your knife and why?