I had a 2009 model, well two pairs, and if i remember correctly you just do it up tight and you should get a small amount of resistance then it will click around a fraction more. It is a failsafe method so you cannot overdo the axle as they do snap inside which while making it hard to function still does not make the axle throw away, you try to get one !!! I wouldnt worry so long as you do it up hand tight it should be fine.