Ducks face, I've seen them used and tested one myself. I want to say there is a video floating out there of one in use, like jody or someone. But checking his site quickly I did not see it. Its not this exact one, but it had a large wheel that was used to feed the wire.I've never seen this particular one before. However, a thin tig glove should provide the tactility needed to slide the wire through. Its a good tool if you have a need for it. But its no substitute as they are a little bulky.