was balancing pull down window to was little metal bar broke it has a 4 stamped on it

A home owner from copemish mi says:
metal bar broke opened window to wash the weight snapped it in half it has a 4 stamped on it
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Bob from SWISCO responded:

Sounds like you need a new pivot bar. Unfortunately, many pivot bars have random numbers stamped on them, so I can't narrow down the replacement you need from this information alone. Can you show me an undamaged pivot bar removed from the window? I should be able to assist from there. 

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