I just tackled this little job for the firts time yesterday. My tube was pre-installed too. I am a guitar player so I just took a guitar string and ran it through the opposite direction, used a little tape and pulled the antenna wire back through. Took about 2 minutes or less. The ball end on the guitar string keeps it from pulling through while you are taping the two together, too. I wish I had though of that before fumbling with it for 15 minutes just getting about 10 inches into the tube. Would have saved a lot of frustration.

DaveCFI