I have quite a few mechanical mods (clone and authentic) and all are either stainless steel or brass. I am curious about some of the aluminum ones that are available. Is their 510 connection aluminum as well or is it ss or brass? Just curious because I wouldn't mind owning a good mech with an aluminum body but a ss 510 connection. I prefer a ss 510 because of long term durability. Any suggestions? This is the reason I have held off on getting an aluminum mech mod.