NICE WORK, both the prototype and updates. My one thought thru the whole process: Is there a way to reverse the rotation of the grinder? If not, I thought that I would buy a cheap 6" bench grinder, see if the rotation can be reversed and, if not, see if the guards could be reversed and the grinder turned backwards to accomplish having the wheel turn AWAY from the electrode end thus eliminating the chance for kick back. This may require mods. to the debris outlets as well but that shouldn't be a game changer.