That Wobble Dado came with either square or Hex adjustment pinions. I would have to check to see if I can find the size. Almost all of these Wobble Dados I have seen or owned have been missing the Adjustment Wrench P/N P1908. For me other than being a collector's item and I have some, I would not use them for actual dado cuts. That is not to say they won't work but there are better options.
