Window pivot 26-125

A quick learner from USA says:
I have purchased part 26-125. I am having trouble fitting this to my window. Please see below, my old pivot (Patent No. 4926524) and your version 26-125. Please advise how to install. Thank you.
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Bob from SWISCO responded:

Thanks for posting. We actually haven't had people say they've had trouble replacing your old pivot bar with the 26-125; in fact, past customers have reported it was a seamless replacement. Can you describe what trouble you're having in more detail? I'll do my best to help from there. Thanks. 

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