I was wondering if it is possible to convert a spinning rod into a Fly rod? I have this older 7 1/2 ft spinning rod that I was thinking about doing this to. I would put on a different reel seat to accomidate a fly reel. The guides are big enough for the fly line. I just don't know what weight fly line would work best for it. Is their a weight that I should use as a starting point and work from there? The rod is medium action with plenty of flex.