I am using Al Campbell's tutorial "Graphite Rod Building" to build two rods. A 4 piece 7' 2 wt and a 3piece 7'6 3 wt. I bought the blanks on ebay. In Mr. Campbell's tutorial he explains how to find the spline. http://www.flyanglersonline.com/begi...hite/part7.php I'm not feeling the "THUMP" he discusses. Is there another way? Or can someone explain it better? Thanks, Jim