I'm building a spinning rod for a river cleanup group giveaway and noticed some odd looking things in the package, which I can now identify as graphite arbors. Piecing things together mentally I'd say they're thing that go under the reel seat. Am I correct? I can use a rasp to, obviously, to reem the center out, so what would you suggest to hone down the outside to fit them into the reel seat. And, there are three separate arbors. Do I need all of them? I cannot find the answers from my typical sources, and hope I'm not considered a traitor for building a spinning rod. You folks have always been a great help and I'm back for another shot of hope. Thanks. JGW