Unbolt the
Wiper Arm and to do this take out the big nut on the outside of the hatch. Following that remove the rear hatch trim piece and remove the electrical connector. Loosen the wiper motor retaining bolts, take the motor off the hatch. Place the motor on the drum and tighten and loosen the largest outer nut for the drum then tighten the three other wiper motor retainer bolts and reconnect the electrical connector. Fasten the large nut until it is very compact, fit in the wiper arm effectively, fix the nut around the wiper arm and fit in the hatch trim piece.