i hate spending cash, so after buying some dirt cheap b50 and wax, i found plans for building a jig on the net (sam harper's ez plans:
http://poorfolkbows.com/flemish1.htm) then got on youtube, watched literally 10 different videos in a row, til i figured out the twist.
(cost: $0 for a scrap board, a buck for nails, $8 for string, $4 for wax, and zero for youtube).
it's really simple, once you figure it out, and it's super fun to do. i have made like 10 strings for every bow i've ever built. now i look for reasons to make more. (ooh this one's frayed...TRASH! time for another string!)