not sure what brand crank, this is, but it is similiar to your 39-016 pan american?

A quick learner from 96817 says:
is this the pan american
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Tom from SWISCO responded:

I agree, our 39-016 was my first thought, as well. The only detail I'm not 100% sure about is the size of the hole on the arm. Ours is a 5/16" threaded hole. Would this work for you?

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