Just replace it then. The expensive felpro rear-main has an plastic install sleeve which aids not messing up the sealing surface on the crank. Use the old seal to EVENLY tap the new seal in. If you are careful there is no need for the expensive rear-main install tool. If you're worried about it, people have gotten by using PVC pipe with a cap on one end. I used the oil rear main to tap the new one in and it's still leak free 4700 miles later. The teflon is more forgiving than traditional rubber IMO. Read the instructions which come with the seal.