I couldn't tell you what a 1A, 1B, or 1C on a kayfun was if it meant saving my life. All I know is there are eight pieces. A drip tip, top cap, 3 tank segments, a base, chimney, and tin man's hat. And the only one that needs any tinkering is the base w/build deck. None of the other parts matter. If you're telling me you can break down fly fishing reels and bring them back to new then there is no doubt you can master a kayfun.
Just remind yourself...you can't vape with a reel and you can't fish with a Kayfun. They require different levels of maintenance and (I speak from experience), the Kayfuns are much simpler. Disassemble only what needs to be disassembled. If you have a dud Kayfun (or transformed it into a dud), then start over with a new one.
This is the main reason I suggested KK get the KFLite Plus over the KF 3.1 - fewer parts & ease of maintenance. Not having an Aqua 2 I can't give any advice there, but if you have it working well enough, stick with that and tinker with the others - or consider getting a KFL Plus if your budget is up to it.
I've only had to replace one or two o-rings over the past, what is it a year already? And never had to replace an insulator.
Kkay, if you'd like a copy of the KF 3.1 user manual I can email you a copy. Send me a PM with your details.

