I have an old 74 Sears garden tractor that I am replacing the bearings on one of the mandrel's. I've removed the top bearings and cut the bearing out from the bottom but the inside ring is still in there (you can see it in the pic). The shaft is tapered and I really don't think that the lower bearing will come off the top of the shaft since both the lower and upper bearings are identical. Does the shaft unscrew to get the lower bearing off? ie. put it in a vice and use a pipe wrench?