redman, I would like to clarify your image of these items. They are by no mean complicated. In fact, I think if you saw them you would laugh and agree they couldnt be simpler. I made them with the opinion to move things with your mind rather than your back. All the device for the concaves does is help move them into place, but they still need some lifting. In other words, the only difficult part we have now is getting them to the vicinity of the rotor compartment. My opinion, I do not mind lifting concaves from the ground; I just do not like wrestling them around once I get them in the rotor compartment. The only other tools we use are a ratchet, pair of vice grips, and a pry bar to raise them after they are in place. After I made this device I just thought, Hey, that worked really nice. I wonder if anyone would like to use thisIJ Please remember that I am gracious for your honesty. Right now, I am just doing some homework to determine what action I will pursue. In fact, I feel that I would derive more enjoyment watching someone use it rather than selling it. Again, Thank You.