Coupler seperation

I know others have more rust issues than we have here but Good Grief Charlie Brown ! I never had so much trouble sliding a box coupling off. The pickle fork (ball joint splitter) does work best. That split pin is some pretty tough steel to try drilling out. It should drive out with a 1/4" punch.
Looking at the pictures I can see a cruise servo that would have to go.
I wont work around or over something that is easy to move.