I'm not sure what you mean by mock cable.
You can make cables w/out using a cable needle - there's a video on the video page, probably advanced techniques. And there are several other good tutorials just a google away.
If you usa a cable needle, you probably want one several sizes smaller then the needle size you're using. There are many types of cable needles, it's totally personal preferance which is better/easier to use.
Mirl56 at Ravelry, too.
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