And then after pulling the axle shafts out, clean up the ends where the inner seals ride with some emery cloth. A really high tech tool is required to beat them out. A 36mm socket on a piece of threaded rod. I put a nut on the inside to hold the socket on as well.

Once both are out, clean the tubes to get the gunk out. Then the tricky part is getting the new seal to start straight. The 36 mm socket fits in the seal nicely. I tapped the seal in and then put a 1/2" to 3/8" adaptor on. A piece of 3/4" pipe sticking through the tubes makes it easy to beat the seal in all the way.

And now it is a matter of reassembling the axle! Happy wheeling!
