Woody,
In an average riffle with the stronger current toward the middle and the slower current near shore, throw the spinner about straight out, let it sink a few seconds, then swing it. You may need to retrieve slowy early in the swing until the current rotates the blade on it's own.

A great, I mean great! book on fishing spinners is called Fishing Spinners for Steelhead, Salmon and Trout by Jed Davis. (I think that's the title). It goes into lots of detail on how to select and fish spinners. It also gives awesome info on how steelhead behave under different conditions. I'd actually recommend it to any steelhead fisherman, regardless of fishing style.
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If every fisherman would pick up one piece of trash, we'd have cleaner rivers and more access.