Hi,
I am a homeowner who recently bought a home that was built in 2005. I am unable to identify the manufacturer of the double hung window that will no longer stay up. . There are markings on the balance spring cover. It shows the following: 30B and then BSI .
The shoe at the end of the spring has no markings on it, but it is made of plastic. The insert is metal. It is on the attached photo. On the left side it is still attached to the end of the spring. See photo number 20230906_131110.jpg
The shoe on the right side has come out of the shoe on that side and the existing end of the spring mechanism. It is pictured on photo number 20230906_131006.jpg.
Thank you,
JamesĀ