Here, at sixth post, you can see how to make ferrules in tapered carbon to transform a single or 2 pieces rod in a multipieces rod.
viewtopic.php?f=71&t=10826Don't consider the points 4 and 5, who explain how to do an intermediate piece between the butt and the tip in a 3 pieces rod.
But you can use these 2 points to elongate, for example, a rod using a cylinder carbon rod to put between the handle (or the butt) and the last piece of your rod. For that you can use a solid carbon cylinder rod ( like these
http://www.eolomodellismo.it/oscommerce ... =2a&page=2 ) or a tube cylinder rolled rod ( like these
http://www.casadelmodellismo.com/fibre- ... 1_373.html ), that you can find in a model shop, who measure the section of your tip of the butt and the butt of the last piece connected with the butt.
With a little investment if you read this and the other my posts you can create a rod with several tips interchangeables and with elongation pieces: with a unique rod you can solve all the situations that you can find. If you make, for example a 3 piece rod and maintain fix the second piece and the handle and you use, for example, 3 different tips and you elongate the rod with 2 different cylinder elongation pieces to put between the second piece and the handle, singly or together, with a unique multipurpose rod is like you have 12 different rods.
For travellers fishers (and not only) should be absolutely perfect.
I think this is my next project.