Thank you, it worked as described. The hardest part is step 7, as the white lugs are solidly part of the body and have no "give". Undoing them requires prising between the lug and the shell forcefully with a fine screwdriver to spring the shell locating tag off. There is then a lug down by the cable entry which is easily sprung with a fine screwdriver. For reassembly I was able to use fine snipe-nose pliers to grasp a piece of the white body through the opening on the switch side and pull the lug into position. The other lug was harder but I made a small hole in the lug with a small screwdriver and used it to drag the lug into position.