The grinding wheel notch was a bit of trial and error but it will kind of wear itself in once you get it close enough for it to spin free. I put the back bolt in and moved it into the spinning wheel to mark where I needed to take away metal. Then between the mill and hand filing got it nice and snug. One of those projects I have put off for years and finally took care of. I use a hand dresser on it but the rest is much better than the flimsy ones that came on it.