I have a 9' graphite blank that I am thinking about turning into 9'6" rod using a stent cut from an old rod. I'm wondering if adding just 6" to the butt would have a detrimental effect on the rods action.? This would be for casting from a sitting position from a pram, hence the desire for a longer rod. What do you think? I would be using a fighting butt. This is a 2-piece blank...