Pressing the new seal in while keeping it perfectly straight and not buggering it up took some ingenuity. By luck, I found that the Craftsman 36mm socket that I used to remove the hub nuts would fit perfectly inside the recession on the inner side of the seal. I had a 5' length of 3/4" pipe in my garage (part of a pipe clamp), which was the perfect length and diameter to stick in through the passenger side knuckle, down the axle tube, and into the pumpkin. I put a 3/4-to-1/2" socket drive adapter in the top of the socket to locate it inside the end of the pipe. Viola! I had a really long driver that would put equal pressure around the entire seal while I hammered on the other end of the pipe (sticking out the passenger side knuckle) with a 3-lb dead blow hammer. Strike lightly at first until you get the seal seated squarely, but once it's in, I had to beat on the pipe pretty hard to get the seal fully inserted into its spot. When you're feeding the pipe into the axle tube and while you're striking it with the hammer, be careful not to bugger up the other axle seal, which is just outboard of the vacuum disconnect housing on axles that have such a thing. Coat the "business" surface of the seal with a light coat of oil before you insert the axle shaft. You don't want it to run dry.