A flathead is the only thing that makes sense, but I don't remember Clayton ever running one in A, and neither does he, but it's been almost 45 years since this picture was taken. I can see where you think this might be a pulley, because it could be except that it looks too close to the motor. I does look like a tall flywheel, which I thought about too, but then I thought it also could be one of those big dark Konig magnetos that were mounted off the side near the front. Most likely it is a flathead with an "obstacle illusion" and our memories are partially erased. Here it is again with the higher resolution in B&W.
clayton hydro.jpg
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