What is the measurement of the longer arm?

A home owner from michigan says:
I'm looking at a #39-253r rh maxim dual arm operator, sill mount, i don't see the measurement for the longer right arm, can you give me that?

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Mike from SWISCO responded:
Good Afternoon,

The measurement from the center of the long arm gear to the center of the button on the end of the long arm is 10" long. See image below.
Measurement of the long arm of the 39-253R operator.
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