What is the Crank arm for a MA-418 Damper actuator?

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Issue:
For an MA-418 Damper actuator what is the part number for the crank arm?

Product Line:
Valves and Actuators

Environment:
Maintenance

Cause:
Replacement / Selection

Resolution:
The Crank Arm selected will depend on the Damper's Shaft O.D. (Outside diameter). They are provided below :

AM-111 Crank arm for 5/16" diameter damper shaft
AM-112 Crank arm for 3/8" diameter damper shaft
AM-113 Crank arm for 1/2" diameter damper and splined actuator shafts
AM-115 Crank arm for 7/16" diameter damper shaft