Mostly. You are correct in that you tighten it in the direction that the spring is coiled, pre-loading it. But many of the fan clutches do not have a second slot to put the end into. So you can do one of two things. Carefully cut a new slot near the end of the bracket or just let the spring tang rest against the end of the bracket. It won't go anywhere because you tightened it by rotating it. It will just get tighter as it heats up. I have limited real world experience with this but plan to experiment myself in the near future. It all makes sense. Heavy duty truck clutches are adjustable from the factory.
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