First make sure pistol is unloaded of course, remove top end and proceed.
I'm doing it on these pics with the factory barrel and guide rod (not my usual setup with the 2 peice rod I mentioned earlier)
Step 1: push down on the recoil spring plug with the tool of your choice in an angle
Step 2: with chosen tool, force bushing to the right (I skip the left turn and go straight to bushing removal) while maintaining plug down

Make sure you keep your chosen tool over the plug once bushing is unlocked of course or you'll have a steel plug straight to the eye, and use either of your palm to collect spring and plug
Step 3: With bushing in the right angle, pull on barrel to pull bushing out.
Of course if you're fancy about your Spartan, you can put masking tape to protect finish, mine serves as a tool not eye candy