Changed my reversing light switch this afternoon. Interestingly there was no washer fitted, and I had to fit a washer to make the new one work ( without a washer it was on permanently), so if changing this switch it is a good idea to have 14mm aluminium washers to hand.
Below is the switch, and the 50mm of oil lost, not a great colour, but as I have to top up regularly as one of the driveshaft oil seals leaks I treat it as a total loss lubrication system!
Also is my continuity tester used to test the switch - any guesses on what the lens comes from?