McCallum, the scarifiers are easy to adjust. There is a pin that wedges in between the scarifier and the frame. Just pull the pin out, it is chained to the frame so it will not get lost, and raise or lower the scarifier and then reinsert the pin. The scarifiers have slots cut in them so that it slides over the frame. The pin goes in behind the scrafier and wedges it tight. I did not spend the money for the hinged rear blade. It's main use is for smoothing. Landscape contractors find this feature useful. It cannot be adjusted, it swings free. I also have a grader blade by and disk by Tufline. They make good equipment. I have been by their plant in Columbus, MS and talked with them. They gave me a tour of the plant. All the folks there were nice. They are making a rock rake now but I don't think it it on their web site yet because they are waiting until they get set up to make them with gauge wheels. Everyone that I know that has Tufline equipment agrees that it is good stuff, especially for the price.