I had to grind material off the spindle to install the disc brake kit. I bought this kit and when it got here I was a bit shocked at its size, smaller than I expected. I was concerned that they would not be up to the task of polishing 45 year old metal. Boy did they surprise me, I used it straight away and it was more than up to the task. I used the cutters that came with it and after the first one the cut quality definitely went down because the second one took longer. However, the ridge isn't