I lube the spring as this improves the sound. If I do lube the click jacket, I only do so by lightly touching the two prongs that rub against the slider and the side bits that slide up and down the housing with residual lube that is on the tips of my fingers. I'm careful not to apply enough to interfere with the click. This is in attempt to get a little more smoothness out of the switch, however, the benefits are negligible.