Hi - I am replacing my existing 3 way switch with HS210 and came across this issue. My old switch has 3 black wires on one side and one red, copper wire on the other side. As per the instructions from TPLink, my switch has one extra black wire. I have attached the pic for your reference. Can anyone guide me how to replace this old switch with this setup. Out of 3 black wires, two are tapped inside the switch body and one is screwed