first of all you need to take the two screws of from the inside trim of the boot panel. then give it a nice pull which should release the clips holding it on. take all the bolts and screws of from the motor and also disconnect the washer pipe, also to be on the safe side in case you accidentally use it disconnect it from the trunking behind the air box. close the boot and give a nice pull on the wiper pretty hard and quick, carefully not to shatter the windscreen lol. if that fails then you could always pop to halfords and buy a pulley use it on your car outside without taking the packaging of and then return it saying you have bought the wrong thing. you can fill the hole with either a blanking plug which securely screws up inside the boot, the other option would be a 25 or 26mm rubber grommet from halfords