If you are like me, you do knot want to change the grit of the sandpaper, due to the fact that you ruin a perfectly good piece of it to change it out. My solution, and a somewhat costly one, is to have a different steel disk for each grit. That way, you change the disks as you progress with the sanding operation without destroying the sandpaper. There are three different grits available for the conical sanding disk, which requires three steel disks.
Similarly, I have three flat sanding steel disks; one I use with the velcro system for interchanging the three different grits when necessary, and the other two I use for the two different cloth backed sanding disks for sharpening.
So, I have invested a tidy sum in having 3 steel conical disks and 3 steel flat disks, but in the long run, I save money because I do knot have to change out the paper sanding disks until they wear out.
