I had to modify mine, button was getting hot as hell.
Made a brass washer for the switch, between spring and delrin, also changed the spring to a copper spring in a bigger guage.
I also sanded the posts and the SS peice the button sits in, there was visable gashes from machining.
then I cleaned it all up with contact cleaner.
Hits hard everytime, no more burning finger, and no voltage loss.
Using vtc4 bats, crown RDA, dual coil @ .4 ohms