Window Opens, but wont shut

A home owner from Nashville says:
My crank works when I open, but the handle pulls out when trying to close. How can I identify what I need in order to get the correct replacement parts?

Thanks a lot,
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Looks like the gears on your operators are broken, which means you need a new operator entirely. It's hard to tell exactly what you have, but see our 39-031 and 39-032. Just make sure to carefully compare our information to yours.
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