I reverse twist my strings with a loop on one end and a bowyers knot on the other. I hand twist the loop and the taper, and then use a drill to reverse twist the main body. I then do the last several inches by hand making it thicker. It's a tedious process, but I can make good custom strings with little $$. I may under build my strings, but they've worked fine so far. TBB II is my primary, almost only, guide.