Does anyone know who makes a box scraper with manual rippers that are all let down at once by way of a lever and indexed to various depths and what would one expect to pay for one? I have seen one before (48") but cannot remember the make and it was on a John Deere 20hp 4x4 (770). The only ones that I have seen for sale 48" and under that would work well on a smallish Yanmar have the rippers pinned to be let down individually one at a time with indexed retaining holes in each ripper blade. I hope this makes sense, the lever I am talking about was more like a handle about 18" long that stuck up on the box and by moving in one direction through indexed points, the rippers would move down until they were as far as they would go. Obviously, when the handle was all the way up the rippers were all the way up and out of the way.