
If you look closely at the button, you can see that this design (by Imeo of course) has the best of both worlds. You can see the brass internal thread which is where all the conductivity happens, yet, the button itself and outer shank are stainless steel which is much more wear resistant than brass. Imeo used brass for all the parts that needed to conduct and stainless for the wear/aesthetic items. This is a brilliant use of materials.
Here's another shot of the buttons contact point, also brass

And here's a shot of the 510 center pin and bottom cap contact pins, also brass.

Imeo, my friend, nice job. These caps and buttons are jewels
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