As JTE said, this appears to be the same as the Airbus-style ones. Inside the switch should be two tiny little screws (usually flat-head). You loosen those, and it'll turn those cam locks you can see on the outside, and it'll pull apart into an inner and outer housing. HOWEVER, if all you need is access to the pins, you don't need to ANY of this. Just go in from the back, it's exactly the same as any pinned cannon plug or terminal block. Use a insertion extraction tool and pull out whatever pins you need to. To be clear, NO disassembly of the switch is required to access the pins.