Replacement coil and housing

Question

Hi I have an American Craftsman window with a lower sash that has broken/missing coil springs and housing. The attached picture is from another different sized window but has the same housing except the number is different. The number printed on the housing of the one I need is "00". I can't read the coil stamp number but the sash weighs about 18lbs. Can you tell me which spring and housing I need?
Thanks

Bob · Accepted Answer

Thanks for posting. This looks like the 15-087 pivot shoe, which works with Series 180 Coil Balance springs sold separately. If the sash weighs exactly 18 pounds, then use the S180-09 9 pound spring, one on each side of the sash. This would give you 18 pounds of overall support. Let me know if you have questions.

Series 180 coil balance diagram