i don't use kevlar any more.
now i use 30lb nylon coated fishing wire. it's easy fast and strong. I have never had one fail. I just loop it though the servo arm , twist two or three times and heat till the nylon melts to its self. low slow heat till you see it melting. use a lighter and keep it about two inches away. on the control serface end I use a rigging coupler for easy adjustment. clean cheep and strong as anything.
I have crashed planes and everything else is in pieces but the wires never break. no crimps or weak spots.
a few meetings ago i brought in a 4ft piece of wire and looped it in front of club. not one member could break the loop with thier bare hands.