Hi Pearltime,
No, I don't think I mean a crimp cover... I Googled that and it doesn't look like what I mean. On several of my necklaces that have french wire, the tread passes through the coiled wire, the thread covered by the gimp goes through the clasp's loop, and the exposed thread goes back into the last pearl or last 2 pearls and is then knotted. But on 2 old ones the french wire is then covered with a wrapping or winding of silk thread so the wire is hidden.
I was wondering how to do the wrapping so that the coil isn't destroyed.