Kevlar works great... try using small eyelets on 2-56 nylon clevis at both ends. It makes it real easy to tie off and then plenty of adjustment. Very simple and easy to replace also. Just make sure to use tubing on the fuse exits. Kevlar will chafe especially if it is a fiberglas or c.f. fuse.
I bought a whole spool of Kevlar used for control line flying for 8 bucks, should last for many airplanes.