How to change a broken electric ariel on a saab

My electric Ariel stopped working and I was quoted £87 to replace it I bought a replacement on ebay for £13 its a simple fix just undo the Ariel nut on top of the car rear wing get someone to sit in car and push radio button old ariel starts to come out simple assist it until it has completely come away from car put new lead into hole then get person in car to switch of radio and feel the ariel start to be pulled back into place be carful to keep it straight as it enters then replace locking nut total time less than 5 mins cost £13 plus one person to assist easy fix