Once you get the parts assembled and are fitting it to the bar end, be prepared to play with it until you get it just right. It's strictly trial and error, and you'll eventually find a balance between how far in the brass expander screws in on the spindle screw, and how much tightening you do with your allen wrench.
Make sure you
always keep your allen wrench with you, as it sometimes works its way loose, and needs re-tightening. I've also noticed that when I'm touring in very hot weather, it's been known to tighten up on me unexpectedly, in which case I just rotate the adjuster a bit....you'd notice it immediately, so no worries there. On balance, it works beautifully and I don't leave home without it
