Need spiral spring replacements

Question

Please see attached. Sorry I dont have an image of the hook mechanism. Looked like a small belt clip with a small tab pin in the middle and a small back pressure tab to hold it in place. Clipped directly to the bottom of the sash. No markings to speak of.

Paul · Accepted Answer

Based on your photos and description, it sounds like you may be able to go with our S400-35 spiral balance with a green tip. Take a look and see if this looks correct. You may also want consider purchasing the 75-005 charging tool to help installing the replacement balance back in the window.