Therma tilt 5000 balance

I'm not sure what it is you have. Can you show me a picture of the part in question? That will help us find what you need.

Hmm... it's tough to say. Looking at the images you gave us, it seems like your window might a Series 600 spiral balance, which might be what needs to be replaced. Another possibility is that you need to replace the pivot shoes. Take a look at the related videos to see what kind of hardware it is I'm referring to. Ultimately, we will need to see the parts in question out of the window.