the tightening sequence of autolock collets is widely misunderstood. the chuck cap itself does not tighten the collet at all, with the cap tight and no tool inserted the collet is loose in the chuck. only when a cutter is inserted will the collet be pressed against the cap taper. the back of the cutter engages with a centering pin and further turning drives the collet against the chuck cap, tightening around the cutter shank, hence "autolock".