There are a number of different techniques to use but one of the most often used is to cast down and just slightly across. With this technique, you cast your line upstream, allowing the spinner to flow back down with the natural flow of the water. When you do this, the spinner moves naturally, producing enough flash to be seen from the trout from several vantage points.
If you were to present the spinner so that it was working against the current, you might intrigue a few trout but in general, this creates too much flash and therefore, over excites the fish. Typically, trout do not follow spinners upstream, as this goes against the way in which real food would travel. Therefore, stay with the flow of the water so your spinner is approaching the trout from behind, which is again, the location of their blind spot.
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