I've been using my light for a bit ajd decided the plunger and qtc aren't for me. I have an old Logan level 2. I would like to keep the ability to operate different batteries in the 17500 body. Does anyone know if I can use the keychain attachment and other parts from the old aluminum body in the new ss qtc body? The easy thing to do would be just use the ss head on the aluminum body, but being able to use different batteries is nice.