I thought this might deserve a separate posting. The first photo is of a 2" grinding wheel mounted on a 3/8" machine bolt used to cut the race. I used a cordless drill running in reverse so as not to loosen the nut. The second photo hows a rough section just to the right of the cut. I almost obliterated the evidence. It took about 10 to 15 minutes to cut it completely through. There is another smaller rough section to the left, out of focus. The third photo is of the smaller rough section.
When running a ball bearing over the smaller rough section, pinched between thumb and forefinger so that it does not rotate, I can feel it catch when it hits the spot. The larger rough spot is too close to the cut to do the same get a good read on it doing the same thing.
Seeing has how none of the discussions that I found on this subject anywhere on the net ending with an ‘aha’ moment, I thought I would do this one up right. The original google search that I used was ‘new u joints now vibration’. This was suggested to me by Google after I typed in ‘new u-joints’, which indicates that it is a not-uncommon subject. I later expanded the search to include <“carrier bearing” OR “center support bearing”>.