Coradco replacement hardware

A contractor from Royal Oak says:
Which part are you measuring at 9 1/2 inches?
Part # 39-155
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Tom from SWISCO responded:
Welcome to SWISCO.com. The operator arm on our 39-155 and 39-156 measures 9-1/2" from the end of the arm to the center of the gear that fastens the arm. From the end of the arm to the center screw-hole of the entire operator is 10-3/4". Do you need to know anything else?
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