How to remove a grease nipple....?

I don't, but I also need to strip down a set of these hubs. I asked a while back how to do it and got nothing, so if you are able to share the process, I'd like to know how.
 
I'll give you a holler.... the front is easy, screw off each end with a spanner and tap out the axle that will in turn tap out the four internal bearings.
 
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