If I may share my experience, as shoot spartans as well...
TheCougar - you are using spartan weights which fit the diameter of the shaft. Marine4Life is using rampage weights which do fit through that bushing (and fit the rampage/renegade diameters) - (as you all probably already know). I've never had to remove the bushing, though I did have one come out one time just because. What I was told to do, is to fit a long screw into the bushing - apply heat to the screw to allow it to transfer to bushing and then pull out with pliers (pliers gripping the screw). Again, I've never tried it, but it sounds logical to me.
As far as how I change weights on my spartans - I use the blue "cool melt" glue first off. When I need to change, I run the shaft under hot water in the kitchen sink. Then I grip arrow with one of those rubber arrow grip things, then pliers on the point and pull apart.
I too have heard H nocks will work. I've thought to use the H nocturnals, but have plenty of x's on hand, so haven't spent the money on it.