I searched the forums and could not find an answer to my question. When I tune my skis I go through the stones from medium, to fine to extra fine. If the skis are in rough shape I use the coarse stone. I file once to twice a year. Always after using the stones I take a gummi stone and run it on a 45 degree angle along the edge to remove the burr. I read somewhere that you are supposed to do that after using all your stones. A friend of mine says that is wrong and you should never use the gummi stone like I am using, but I read if you do not do that the ski becomes grabby. Who is correct? Should I ever run the gummi along the edge?