thermal industries series 5000 double hung window

Thanks for reaching out to us! I'm afraid I can't identify what you may need from this description. Can you show me a photo of the pivot shoe removed from the window? I can narrow down some options from there.

Thank you for the photos. This reminds me of the 15-251 single support. The 1/2" Series 160 are the compatible coil springs. Take a look at the specifications and see what you think.