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I like the idea behind it. It's simple and effective. But your problem is that it looks just like two bits of sprue stuck on. I would grab a file and reduce the width and height of them a little bit, so they don't stick out so much.
Perhaps aim to make them the same size as one of the 'spokes' around the end. It would make the modification look a lot more integrated and part of the model. If you see what I mean?
Guitar string is a great touch and really adds to it, but it's a little too long for my liking. Good stuff.
I agree with Ravendove, it does look a little too much like sprue still - it's just out of scale with the rest of the model. The guitar string does look a little overdone from the side. There's enough there for the torso to spin round a couple of times and still not have problems, so it might be an idea to make it closer to what he would need just for the sake of mobility.
Other then that, a good use of an unused/unwanted destroyer. After this and the Flayed Ones, I really want you to have a go at a couple of Warrior -> Pariah conversions...
If you simply bought some nice plasticard rods of the right size this conversion would be impossible to tell apart from the regular model...
Sounds like you are using the steel core guitar wires. While they can be a bit difficult to bend in to shape at first, they will stay bent once you force it to a smaller radius curve. As long as you have the wire bent to the size/shape you want rather than using the model to hold it in the desired shape, you'll be fine. The other solution would be to either use smaller-gauge guitar wire, or try to get hold of some of the more flexible nylon core guitar strings.