OK OK I got it finally. If anyone else has this problem, here is the solution:
remove the build deck, all O-rings, small insulator in the center of the 510 so you have ONLY the base. now, screw the base on a device, screw the tank section to the base (without the build deck and chimney). Now slowly apply negative pressure, gently pulling it apart from where the two pieces of the base are press-fit together. It will eventually become looser and looser, until it opens. Be very careful here. There are 2 VERY VERY VERY small balls inside the base, one of which is a little bigger and has a spring behind it and pushes out towards the inside walls of the air flow control ring and gives you the "clicks". remove both of the balls, clean them out, remove the spring, pull it to make it a little bigger, put it back in, followed by the two balls and then put the air flow control ring back on, and press-fit the other part of the base back into place. DO NOT over tighten it.
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