Lighter Fix Tips

Excellent job Mark, great post.
Question, I'n the past I was always told to shake the butane before filling your lighter. Now I've been reading that this is a BAD method. Don't shake the butane can before lighting they tell me. Any ideas? I understand the concept of both methods, but which do you guys suggest? I've pretty much followed Marks post down the line for some time now, so, I've had minimal lighter problems. Just curious about "Shake, NO SHAKE".