One of the most difficult parts of radio repair is re-stringing dial
cord used to tune the radio. We have actually run into older un-documented
radios (1932 or older) where we could not successfully restring the radio.
Without dial stringing documentation, some radios are simply impossible to
restring.
A dial string diagram looks like this:

DIAL CORD RESTRINGING
Any radio or repair that requires
restringing the tuning dial cord, costs $45.00 to restring and in some
cases $95.00. If you have never tried to do this then you cannot
appreciate how frustrating and time consuming it is. If you think the
price is too high - be my guest and do it yourself. Restringing can
involve multiple hours and delays due to research [ Many radio
documentation sets do not have adequate dial string diagrams.] A radio
that has a particularly difficult dial cord setup can in the worst case
consume 20-30 hours of actual clock time. We do not bill for this time.
Radio Repair Guy