Fleetwood very difficult to open

A quick learner from California says:
I bought some used Fleetwood metal windows from a contractor who's doing a renovation on another house.
The windows are very hard to open. I think they may be having a balance problem. The balances on your website are all 9/16", but this one is definitely 3/4" wide.
User submitted photo of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! Yes, I know this balance. None of our standard balances can replace it, so it will have to be custom made. Before we begin, there should be a stamp printed on the metal channel, probably a four digit number. Can you tell me what it reads?
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