Foot-pad cracked-skin scraper

For several years I have suffered from thickened, cracking, inflamed skin at the edges of my footpads.  The cracking is due to non-compliance of the thickend layer, which is shed skin lingering due to an adhesive that is weakened by hot-water soaking.  Pumice-stone rubbing after footsoak or shower didn’t suffice.  Similarly, Dr Scholl's foot file wasn't aggressive enough.
Sometimes my fingernails after a shower-bath were surprisingly effective, so I imagined a device that would act like a crowded bunch of fingernails.  The device described and pictured below worked better than expected, separating dead, adherant skin quickly and thoroughly without harming the live skin beneath.
  Here’s how it’s made:  Buy a multi-diameter hole-saw attachment for a power-drill.  Remove the shaft.  Leave the blades all in their slots, secured by glue if necessary.  Using the flat side of a grinding wheel, grind down the saw teeth uniformly almost but not quite completely.
After a bath/shower, rub the thick dead skin gently back and forth with the abrasive face of the scraper.  The dead skin will roll up and/or flake off exposing the good skin satisfyingly.  Don’t try to do it all in one sitting.  Repeat the process after subsequent baths/showers until the offending dead-skin accumulation is finally gone – and soft, noncracking, living skin prevails.