Back on the original topic, my Loclines always creaked especially at the end of the dive when I tidied everything up. My dive buddies always knew it was time to get back on board!
Having used both flexible and fixed arms/clamps, both have their place. Loclines are especially useful when you need fast adjustment to awkward positions e.g. on macro shots when the positioning of the clamps can jam the movement that you are looking for on the strobes.