Advice for fishing new SS hard brake line thru tunnel on 73' 911T

[Crdesign]

Hi,
Does anyone know where I can find out the trick for pulling the hard brake line thru the tunnel?
I have tied a wire to the front of the original line and think I can pull the old line thru from front to back.
I can only observe one wire tie in the tunnel holding the existing line in place.
Is there any others I don't see?
This is an original car that has sat for over 20 years in a garage and no mods have been done for as long as we owned it since 1984.
It is very clean but since I am replacing all the other brake lines with SS I want to do the tunnel line too.
What is a simple trick for pulling this other than the fish wire?
Any and all advice appreciated and welcome.
Sincerely, Tim
Crdesigns@yahoo.com