4x4 help

[smokinn]

Ok on my 82 i went out and bought a new set of lock out hubs. The ones that are on there are all worn out so i bought some nice shiny new ones. The ones that are on there now look a little different but made by the same company warn. After removing the screws from the caps I figured that they would just come right off? Wrong. There looks to be a nut or something holding the second half on. Any ideas as to what i need to use and how to get them off? or do i have to tear down the whole front wheel hubs just to do this? Or should i just take it to someone that knows what the he** there doing?

Thanks
Jason