[Brad_Blazer]

Here is my idea on combining the designs shown: Use a sizeable tube over the scarifiers to resist bending and twisting. At each end of the tube a pivot arm is welded to the tube and pinned to the rear of the box blade. the tube will travel in an arc and the scarifiers need to move straight up and down so a shackel is used to connect the tube to each scarifier. By shackel I mean something like the rear connection between a leaf spring and vehicle frame. I am attaching a crude sketch. If the tube needs to be higher to clear the 3-point braces you can use longer shackels.