[NostalgiaRadioTime]

You may want to have a look at this video series that Buzz1151 posted a few years back when he was restoring a T-64. I know he dealt with the dial string on one of the videos in the series. Just which one I don't know, but here's part one. You should be able to find the other parts by searching for "1939 RCA Victor Model T-64 Restore Part  " and just type in the next number (part 2, 3, etc.)

https://www.youtube.com/watch?v=Z2RyZgiYvwE