I got the replacement crank arm today and I can't see any way this part will fit. The part is 39-264
was supposed to be the replacement for the awning window. My operator has a few part numbers.C9400-1 on the top, F9400-8B on the bottom and 1521101 on the arm. The arm is 9" from the center of the operator to the 8-32 threaded hole at the end of the arm.If this is not the right part, can I exchange it or get a refund if you dont have the part. I ordered this part because one of your reps said that this was the right one.I included some pictures if they come out.