Howdy Folks! My 1st time out here,But I've been a Spider for many moons & Finally Registered/Donated$$ to the site.With that outa' the way now,Regarding the Mg blocks not functioning as they should,I Also have had some difficulties,until I ran into a site on ebay.This fellow is located in the Industrial section-Metal Alloys.He sell's 1lb bags of Pure Mg.Shavings & 25 cotton balls with his own secret recipe of metallic powder,infused thereof. Aprox.$15.00 shipped to the 48 This stuff is THE BEST,& Light as a Feather! I pack this in many tiny zip-locks & dispurse them throughout my gear components,so that I may Never be without this Excellent Source. Just go to ebay & Type in Magnesium in the search box,His Handle is mykobi57 .These cotton balls will light with a few sparks from an empty Bic lighter,& you add a small pinch of Mg. shavings on top,& you can burn wet tinder,If you have to!I Hope this Helps everyone as,much as,It Helped me! RoverOver