To remove the lower shaft from the steering rack pinion, work in the engine compartment using a ratchet, socket, and several extension pieces to slacken and remove the pinch-bolt, discarding it and preparing to fit a new one. Next, undo the screws to take off the trim panel over the driver's pedals, then undo the pinch-bolt at the universal joint between the intermediate shaft and lower shaft, discarding the nut and pushing the intermediate shaft upwards into the upper column. Fold back the floor carpet and the top portion of the rubber boot at the base of the steering shaft, then prise out the locking ring from the lower portion of the rubber boot, removing the boot and bearing assembly along with the shaft. For refitting, engage the universal joint with the steering rack pinion shaft, ensuring it is fully seated and aligned with the groove on the pinion shaft, then refit and tighten the new pinch-bolt to the specified torque. Lubricate the needle bearing in the rubber boot with grease and the lower portion of the boot with soapy water, then fit the lower portion to the collar on the bulkhead for a good seal. Press the locking ring into position around the boot lower portion and the bulkhead, fold down the top portion of the boot to seal around the locking ring flange, and refit the carpet. Finally, reattach the intermediate shaft universal joint to the lower shaft, tightening the new pinch bolt nut to the specified torque, and replace the trim panel over the driver's pedals.