The choke base is a bit loose on the facia. With a mirror (on a telescopic stick) I can see a largish brass nut in the back, but sign of a choke light switch. Not too worried about the switch, but like to tighten the nut up - if brass sounds original, any idea what size it might be please?
I think from memory when I did mine I used a pair of long nose pliers ( it was a long time ago) but now days you can get some very wide opening adjustable crescent like beasties that are only about 100 mm long.
I studied some pics of choke cables and reserve tap cables and measured the size of the mount just behind the knob, and guessed that 3/4 would be close to the nut size. Then I got lucky and found a tube spanner of 3/4-5/8 on a shelf. Cut in half, slotted, bit of filing to get the slot just big enough to go over the cable. Bingo, it fitted well enough to tighten up the nut, now all works as documented! Smaller hands and better access would make this a lot easier, but its done for now.
When I looked up the tool in the WSM, its described as suitable for the choke and 'reverse' cable nuts....