It's not that easy to repair once opened. I am having trouble getting a new seal pressed into place. I damaged one seal already trying to get it into place and will seek some help getting another one in place.
I am trying to get a replacement off of ebay and will try to rebuild mine and keep it as a spare.
I will let all know if I get the original one repaired.
I've seen this done! If its the very big seals you need a large diameter piece of plastic pipe on top of the seal and a bit of wood over that and tap it in. One of those trade tips I seen a mechanic do.