Starting on the rear hub, locate the nubs on the Mavic bearing adjustment tool and note that they engage the inner flange on the left side. The left-side endcap is only held in by an O-ring. If it won't pull off by hand, then slip the 17mm cone wrench over the endcap on the drive-side of the rear axle and then unscrew the bearing adjustment flange. This will press off the left-side cap.