Had to have the bearings replaced on my bush hog shredder. The wheels did not have dust caps and the supply store only had two sizes. I took the ones closest to the size I thought I needed (Other size was obviously too small). Got them home and they didn't fit. My boyfriend looked over the situation, pulled out his skoal can which was about empty, took out a dip, placed the empty can over the bearings. Voila!!! It fit perfectly. Don't know how long they'll last but the shredder has been used several times since and the skoal cans are still in place protecting the bearings.