A rod building expert I ain't Tommy, so I'm going to guess that a fulcrum butt is designed in such a way that leverage, resistance, and forces are equal on either side of the butt - OR - that these forces are the same for the butt and the tip where they meet. I don't really know. Just guessing based on what I looked up about a "fulcrum".
Tommy I have always understood it to mean the butt it going to bent in the middle where your upper hand is placed . This allows loading the rod easier all the way down into the butt section . Probably achieved by a reverse taper of some kind in the butt section . Standard butts are parallel and have a uniform bent throughout and take considerable force to load fully down into the butt section.
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