rotating arm

A home owner from montreal says:
Good day

I would like to replace the rotating arm as showed on the picture. The part that attaches to the window is loose and does not hold. SO the mechanism does not work anymore.

could you indicate the righ piece to order?

Thank you
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Casey from SWISCO responded:

Hello,

Take a look at the parts that we've related for you, including the 39-220B and 39-221B Encore operators, to your original hardware. Thanks for positng! 

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