I always look for the bevel on the edges, that bevel must sit flush with the bore. In fact, when you reassemble, you'll have to center the butterfly on the shaft, which will then establish the orientation and exact alignment location in the bore.
There is a small machined flat spot on one side of each butterfly. It is milled to half thickness or so on approximately the red area of this example throttle plate . I have never seen this before... how should this be oriented?
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