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Hello, thank you for posting,

The window uses older crossbow style balances that are no longer made. As long as the original spring is a 1/2" diameter, you should be able to convert to the Series 795 channel balance. We stress measuring the spring to confirm the diameter as if it is smaller, the Series 795 will not work.

Please review the step by step video below that details the conversion and additional parts needed. Let us know if you have any additional questions!