Mike O'Donnell wrote:

....
What I found out is that at the top of the window frame (inside the frame),
there is a plastic trim piece held on by screws. Under that, on each side
is a metal mechanism, about the size of a pack of playing cards screwed into
the top of the frame. It has "Anderson Windows" stamped on it, along with
what looks like "CC 9 27 -12". In that are two wheels with springs that
wind up the sash cords. It doesn't look like there's any way to get the
thing apart, and I'm trying to figure out how to attach new sash cords to
it.

If "Anderson" is really spelled as "Andersen" I'd go to a local
distributor if you have one or contact them directly come Monday...I've
not seen their mechanism of that type so don't know about it...


The other question I have is that I can't figure out how to get the sash out
of the frame ....

Probably similar vintage replacement frames here (altho not Andersen)
are actually a spring-loaded side sash---pushing the window in to the
right side channel will allow these to slide out on the other
side...that's only conjecture I can offer.