The easiest way to remove the spigot bearing is to fill the hole (and the voild behind the beaing) with grease and use something that is the same size as the opening to put in there and then tap the end with a hammer, you might have to repeat this process a couple of times before it comes out fully. I have found using an old input shaft from a gearbox works best as it's exactly the right size, but an extension bar or similar will do.