Years ago there was a bunch that made that type cutivators to fit a Farmall. I think it was Planet Jr that made them but I could'nt find their product list on line. You could build a set up from a Catagory 0 set of disc like the old Sears or Bradleys. They have 2 sections of 3 X 12" disk blades. Just build a A-frame to fit your lift and spread the disk sections far enough apart to straddle the row. Be sure you turn the inner disk blade around backwards on the shaft to the others so that it won't be too aggressive on the row beds. And you need to use smooth finish disk blades instead of the scallop blades. It does a lots better job than sweep cultivators and you can run along at a faster ground speed. Another option is if you can find and old disk hiller plow all you would have to do is turn the inner disk blades around backwards and adjust the sections to straddle the row right, you might have to remove a couple of the outter blades to narrow it down to fit your middles, the pins are cat-1 and would fit your 3 point already.
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