Thanks Chris
I tried to do the same for the headlight switch and run into a snag with it.
With the headlight switch the knob must be pulled off, but inside there is a locking tab on the shaft that holds it on. It seems that once the knob is pushed on with the unit all together there is no way to access the tab to get it apart safely. I was 99% there
I ended up using pliers on my stock one (I'm using a Jade Black holden version) and it broke the locking tab. Once that was off it all came apart very easily. If we didn't have to pull the knob to activate the fog lights then it wouldn't be a problem or if you just applied a little glue once putting it back together.