Tim Flagler provides a detailed video guide to contructing a 10-foot 4X leader.
As Flagler says: “Today there are more choices than ever when it comes to tapered leaders and I think most people are content to use the manufactured, knot-less variety. But, as with fly tying, there’s a good bit of satisfaction and knowledge to be gained by building your own. I learned to tie tapered leaders when I purchased an Orvis leader-tying kit some 30 years ago. I keep the kit around for sentimental reasons and still use some of the leader formulas that came with it. Nowadays, you don’t have to buy a dedicated kit, although there are some available. You simply purchase spools of leader material in different diameters and tests, do a little web research to find some well-established formulas and then have at it.”