Single Arm Crank, 9 1/2"

A quick learner from New York says:
Is the single arm crank (Product Code 39-139) available on your website manufactured by Truth? I have two window cranks manufactured by Truth that I would like to replace. The image for Product Code 39-139 matches my window crank but the dimensions appear to be slightly different. The arm is listed as being 9.5 inches based on your calculated dimensions but mine is 8.5 inches. Could it be an error on your website and the arm should be measured from the actual middle point of the gear to the end of the arm? That appears how the dimensions are calculated on other websites with the same window crank. Thanks for your time and help on this matter
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Mike from SWISCO responded:
The 39-139 operator arm measures 9 1/2" in length.
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