Go buy a couple cheap large toothed hacksaw blades. Bend/break off a 2-3" section, drill a hole in the end, then attach to the lanyard of the mag block.
By scraping that little blade down the edge of the mag block you can quickly create a generous amount of shavings. That hacksaw blade will also create a massive shower of sparks from the mishmetal rod (although doing it this way will drastically reduce it's useable lifespan.)
By scraping that little blade down the edge of the mag block you can quickly create a generous amount of shavings. That hacksaw blade will also create a massive shower of sparks from the mishmetal rod (although doing it this way will drastically reduce it's useable lifespan.)