Are you referring to this?
http://flyfisherman.com/rodbuilding//index2.html
"PREPARING THE BLANK
Check the length of the rod sections and make sure they are approximately the same length. If they are unequal, trim the longer section(s) with an abrasive cut-off disk or with the edge of a file. Do not use a saw, as the teeth will tear the graphite fibers. I like to have my tip section about 1/2 inch shorter than the other section(s), as the tip-top will usually add that much length to a built rod. Do not trim any mid-sections as you may ruin your ferrule fit. Trim only from the ends of the rod if necessary."
Personally, I'd be very reluctant to cut anything off either end of any piece of a blank, unless the manufacturer specifically states so. As an example, cutting off even 1" from the tip end of a tip section of a blank can change the line weight rating by a full line weight. And if a 2 pc. blank contains a spigot ferrule, the sections WILL be different lengths if including the male spigot in the measurement.
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