Vacuum line instalation on standard 31 coupe.

[moosey52]

Hi, I was hoping someone could advise me on how to install the covered steel tube that runs up the inside of the windshield support on the passanger's side of my 31 standard coupe. My car doesn't to seem to have one in place so I bought the steel line from Snyder's a while back. I can't for the life of me figure out how to fish it down inside without taking the visor off and who knows what else. With the small bend, I figure it must go in from the top. Any help would be greatly appriciated. Thanks!