Searching for L901WC

A quick learner says:
We have Pelli casement windows in a house we just purchased. The window is fine but the hinge is missing an are so it doesn't swing properly. The serial number acoustic g to spells is L 901 WC. Do you have a replacement?

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Casey from SWISCO responded:

Hello,

I'd recommend comparing the specifications of an intact hinge to the options we've related for you to determine how the dimensions shown on our product pages compare to your Pella assembly. Thanks for posting! 

A quick learner says:
I am a first timer to fixing these windows. Should I measure a certain part of the window? I will be back to the house late Tuesday and get get all the dimensions.
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Casey from SWISCO responded:

There are diagrams on each of the product pages for the parts that we've related for you that show the relevant dimensions for these Pella hinges to compare to yours. I will add an example below.

You'll also need to confirm that the hinges are a visual match to our photos. 

Dimensions for 39-394
Dimensions for 39-394

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