The only problem I used to have with my old Wild Country VC was that once the wire was stripped bare it was much more flexible than the insulated wire - invariably on rappel it would flex inwards and 'pinch' between the rope and the belay device body (hard to explain).
The result was a jerky, horrible abseil, and when it got caught when belaying, a jerky feed out of slack.
I got a new belay device (different brand) and no more worries.
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