I am looking for a source for 4” diameter surface grinding wheels that are a 1/4” wide with a 1/2” arbor. I searched Norton’s online catalog and I have only been able to find two options in that particular size. Can anyone tell me where they are getting their wheels from? I have been told by a fellow member here that 1/2” wide wheels are too wide for the Sanford SG and SG48 surface grinders