for back blades that are serrated for etching heavy ice build up? Last Jan we were supposed to get five inches of snow but instead we got a couple inches of rain and it went into the polar vortex the next day. A friend of mine who has a very long and I mean very long driveway is considering cutting teeth in his back blade. I feel that would be a mistake and was wondering if there is other options either a single purpose replacement or making one. Can't seem to find one on the net when googled.