Good Afternoon,
Very nice pictures, I have them marked for review by a window expert here. Quick question though, can you respond back here with the stamp that you should be able to find on the metal channel (it may be a little faint). The stamp helps us to determine the strength of the replacement balance you will need.
Yes there is a stamp on the backside of the channel. It says "28 3 FP CALDWELL". Those are the only markings on the channel, unless there is something inside that is covered up by the spring and inner workings.
Thanks for the quick response.