I know it can be and is done all the time, but what is the affect on the blanks action. I'm building a couple of rods. Both blanks are 7', one being fast action and the other is moderate fast action. Both rods a medium heavy power. Because of deck space, I need to shorten both of them at least 3". I don't think taking material of of the butt changes anything in the action, but to what degree will it affect the power?