NuPrime Double Hung Window Bottom Sash Pivot Bar

A quick learner from Carmel, NY says:
Looking for die cast pivot bar for bottom window sash. Can you help me identify for replacement(s)? Do not know if pivot bar can be used on either side. Curious as to how such bar is attached to the window sash. Thanks for you help and advice.
User submitted image of their window hardware.
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Paul from SWISCO responded:
It's tough to say what can replace this. There are a lot of details I'm unsure about, namely its size. That said, I've made a list of possible replacement parts you could consider. You can review them on the right side of this page. These all mount to the sash via screws, but yours seems to be missing its screw base. I'm not sure if it broke off, or if it was designed some other way.
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