Good old fashioned cable needles. Not much more to say except they are an essential part of your knitting arsenal. I often use them for catching dropped stitches before they can slip any further down (and they're useful for keeping your hair in a funky, messy bun...).

Each pack includes a 2mm cable needle and a larger 5mm one. You don't need to match the needles you're working with exactly, you just needle to use a cable needle that is smaller so that your stitches don't distort.

Cable Needle