The schematic in Riders is no clue but good its there at all!
Closest match radio dial cord guide lists is an Airline 62-373 and 374, diagram 11 below.
Radioatticachives.com shows a 62-375 set that looks similar.
Cord 11.jpg
It looks as if an extra wrap on the dial side is needed so no string moves toward the bracket at either end of range. Dial string should be traveling past the bracket on both sides, but never unwinding off the tuner wheel to point it moves toward and contacts the bracket.