I am a newbie rod builder and was wondering how do you know if the spine on thisF1166/7 4 pc blank is all lined up correctly? Now that I have the blank I notice that when put together it isn’t very straight and kind of kinks this way and that way. Does this blank have a natural curve to it? Do all blanks? Each pc definitely has a pronounced wobble to it when rolled on a flat surface. Is this normal? Any info would be greatly appreciated.