Handbrake adjusted. Managed to get to the nut without removing the heat sheild. 16th of a turn at a time with a 13mm spanner. Needed about 4 whole turns, 60 tiny turns , flipping the spanner between each turn flat on my back and my eyes not being able to focus on the nut. Now the hand brake grips on the 5th click and is tight on the 6th. Happy.