There's no real good way to store your collection of cutting, grinding and sanding discs in your toolbox. They either end up mixed in with your tools or tossed together in a drawer. In either case, it's a pain to sort through them every time you have to switch to a different disc. As it turns out, 4" discs fit rather nicely into CD spindles! If you don't already have one at home you can find them for about $2 online. A medium-sized spindle like the one in the photo can hold about 20 to 30 discs depending on type. Just group your discs with…