You may not be able to get it off clean but if you have a heat gun you can get the epoxy real hot and it will peel off sometimes. See, heat transfer!! Try not to over think this. On a pull/pull set up you want the servo arm to be even and you just go into sub trim and move it until the arm is centered. If your servo arm is one inch long you want the wire at the rudder to be at one inch long. If you have a nice straight shot for the wires then you want to connect them so the wires are right side on right side and left on left. If not then you can cross the wires. Sometimes you will just have to live with one wire going slack while the other is tight but if done correctly they are both tight when the rudder is deflected. That's in a perfect world but with an ARF sometimes you just have to live with how they have things set up and it's out of your hands. When I build a plane the set up is always on my mind and I build with that thought in the back of my head so things go smoother for me in the long run. Now if I could only remember to install the servo wire tubes in my wings before the wing is assembled.