Originally Posted by king joe
All said, Art Schenk says...the majority of fly fishers wouldn't know the difference in casting or fighting relative to guides ON or off the spine. I think THAT is where the primary issue is.
King Joe Outa Here!
That right there is the key. You have to realize that the practice of spinning a rod started way before graphite and carbon fiber. When I started building fiberglass was king and those blanks had VERY noticable spines. If you cut and ferruled a one piece blank (very common since you couldn't buy a multi piece blank) and didn't line up the sections after cutting it they would twist at the ferrules when you put a load on the rod. Heavy offshore rods would definately twist in your hands if the rod wasn't spined. Spining a rod would also impact the cast (not like you would actually try to cast a 5'5" 130lb class rod) but the power to raise and fight a fish was way more important. With todays materials and manufacturing processes spinning a rod probably wouldn't make a noticable difference, but I do it anyway