Pella operator replacements

A quick learner from Ames, IA says:
My Pella windows were installed in 1977. The crank mechanism has a hook on one of the arms which draws the window in the last inch or so during closing. I do not see this on your crank assemblies. Isn't this hook necessary ?
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Tom from SWISCO responded:
Thanks for contacting us. Could you show me a picture of the hook in question?
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