Measurement of arm

A home owner from Bethesda< MD says:
April 13, 2019
I notice that for some casement operators you have both 6"and 9" arms. It is not clear to what that measurement pertains. Is it the long straight section of the arm or does it also include the bend and gear mechanism? I have an old Getty device that measures 8" to the straight section of the arm. Would a 9" replacement work?

Thanks.
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Bob from SWISCO responded:
April 15, 2019

Thanks for writing in. In the case of these particular operators, the 9" from the very end of the arm to the center of the gear. These exact specifications differ from manufacturer to manufacturer. If your old operator's arm length differs a bit, you may have to remount the track, if you have the room. If you don't, let us know. 
Wood Window Crank, 9"
Wood Window Crank, 9"
39-020
$33.50
Wood Window Crank, 9"
Wood Window Crank, 9"
39-021
$33.50
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