If you get kinks in the cables, simply let them soak them in hot water. You can use any kettle or warm the water in the mug using a microwave. Once you notice some steam appearing, it’s time to put the cables there. After a few seconds, remove the cables and check whether the plastic is loose enough to get rid of kinks. Don’t submerge the knitting needles in the water, and don’t let the cable sit in there for too long to avoid possible damages.