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Thanks for reaching out to us! What you have here is an old crossbow style balance. These unfortunately aren't made anymore, but the good news is that you can use our modern Series 795 channel balance to replace it. It just takes a little handiwork to convert your window for use with this new style, so I highly recommend watching the video below. This will walk you through it step by step.

Please also note that this solution only works if the spring diameter of your old balance is 1/2". If it's smaller, then let me know; we'll have to pursue other options.