BTW I don't think enough has been said about the new Pinch 510 and feed pin. Been using them day in day out now for about a month and I gotta say that they are a huge improvement over the previous Pinch hardware.
I'm running the 510 with the o-ring under the BeCu switch plate that not only allows you to perfectly position your air holes but more importantly creates a perfect leak proof setup. I simply love it. Highly recommend all previous Pinch owners get a retrofit. I remember every time I removed my Nuppin with the previous 510 I always had liquid under the switch BeCu plate. The new one is bone dry.
The new 510 positive feed pin is a winner too because of its smooth machined finish the feed tube snugs up the tube of the pin creating a perfect seal. Our previous setup was a 6-32 screw and with time the tube would erode from friction with the screw threads and liquid made its way up the threads and out the top of the tube. The new setup is perfect and easier to remove without damaging the tube.
Thanks Pete for these great improvements which make the Pinch even better.