I have a 7 foot Farm King, (now Buhler I think?) and I removed the blades the second year I owned it to try and sharpen them. I don't think they had ever been removed as it was a battle to get them off the first time. Since a liberal application of Never Seize and a cleaning they are easy to get off/on.
I tried to sharpen my blades with my grinder but damn that is hard steel! About the best I could get is an edge about as thick as my baby finger. We have lots of rock here so not sure a nice fine edge would last long anyways but it would be nice to have some sembalance of an edge for cutting the grass and light brush. I have found any rock "coffee cup" size just turns to dust upon impact. Some a bit larger get broken into pieces and scattered and anything larger than that generally causes a ruckus back there and I have to lift over it. All I have ever done to balance my blades is balance them across dead center then beam balance the two together. Close is close enough and away I go. I think I should buy new blades so will have to find a Buhler dealer nearby I guess.
Regards,
Dave.