Incase anyone else had the same problem. My boot key hole didn't work, it just flapped about in the wind and when i remove the boot trim i was met with about 6 peices of metal. The key unit comes off with 1x 10mm bolt. Undo the bolt and twist the unit, it comes off then remove the cable from it. I found everything just slips back on over the cylinder and the sping and what looks like a broken dish. Slips back over the end of the cylinder. This holds it all in place. Not sure if anyone else has had this problem?