OK yesterday i call my dealer up and ask him about running double blades. He acts like i am stupid and says what are u trying to do. I explain to him what i want to do with running double blades and he says he has never heard of anyone doing this. I was going to ask him about a device to hold the blades in a + position, but not anymore cause he doesnt know anything about it. So let me ask the pros on this site, does anyone use a device to hold the blades in a + position or just put them on the bolt and tighten them up?