Ok, I'm confused sorry if I'm just being dumb but try to help me out here! You have more than one unit right? If so, I'm guessing that you have at least one unit for string trimming and one with an edger blade on it. Or do you have one unit in which you switch the trimmer head out for a blade Or do you just edge with your string trimmer head. Cuz your gonna spend 250+ either way if you have more than one unit so thats why I asked "can't you just buy a unit with an edger blade and guide attachment on it already". If you only have one unit and don't wanna spend the money on another and instead buy the edger attachment then that makes sense to me.