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TS10 emitter swap between brass and aluminum?
You could just desolder the wires and pull the led board (MCPCB) out of each light the solder the whole board into the light you want.
The trickiest part is soldering the small wires, if you have fairly steady hands and a soldering iron you can do it.
Here is the MCPCB removed from the light
Here they are going back in
I actually changed the emitters to colored ones. But you don't need to actually change the emitters, just pull the boards and switch them.