I am looking for an easier way to sharpen mulching blades. I now use a handheld angle grinder and butchering my blades. I would like something like the RGB but they seem only to work well with straight blades. The Magna-matic has a $950 model that will sharpen mulching blades but I am a part timer and cannot justify that rediculous expense. Does anyone use an RGB on mulching blades? If so, how well does it work? If not, what do you use?