Patriot Window Replacement Part

A home owner from New York says:
I'm looking at product codes 15-195 and 15-195B.What's the difference between open cam and closed cam? I can't tell by looking at my part.
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Bob from SWISCO responded:

Thanks for writing in. Good question! The 15-195B has an 'open cam' that you can look straight through. If  you hold the shoe up to your eye, can you see through it? If you can, it's the 15-195B. If you cannot, you have the 15-195 Closed Cam shoe.

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