Alot of guys out here are running double blades and supporting them, but, does your machine? I have been reading the past posts and doing alot of talking with dealers about buying new mowers and such and they have all supported what i think to be true. A mower is sold with single blades on each spindle and built to support that single blade.(Bearings, nuts, bolts, shaft, and belt strength) So has anyone thought about the stress you are putting on that machine? Granted it might not be much or even noticable by the operator, but, even the slightest wear and tear is a very bad thing over an extended period of time. Take a 1 ton pickup and put in 6,000 in stone all the time. It will not last very long. I went further into this and found that , if i remember correctly, Gravely is the only company that is designing and coming out with a double blade machine that is built for supporting double blades.........Just a little bit to pnder on i guess. For me a good sharp set of blades is the best!