That would make way too much sense...to be able to add the two blades to the point of an existing bit....Then Jiffy wouldn't be able to sell you a +$100 new auger bit! I called Jiffy the first year those ripper blades showed up, asking to do the same thing. The sales lady said it would not work. The blades have to be installed in the exact correct location in order for them to work properly. I think if I had some drawings/template, I could take by bit to a local machine shop, and they could drill the holes!