I have to agree the little parts are what drives cost and frustration levels up

The simplest lockable switch design I have is only 3 pieces that needs to be turned with 4 COTS (Commercial off the shelf) pieces/parts.
Would love to see it when it is finished. I have designed and prototyped about 15 different atomizers. A couple great some so-so, and a lot crap. Just because the initial one may not work correctly you can always revise the design. Keep that in mind and don't get discouraged.
Dan
Yep, I thought it would be a pretty easy undertaking until I had to really start thinking about how it was going to work. Then the complexity of what I was trying to do set in.
That e-machine-shop app you linked is pretty easy to learn how to use, and it's what I designed all my parts in. I'm going to do all the initial machining by hand however. I had a year's worth of machine shop back in high school, so I'll just have to dust the cobwebs off those old memories and get back to work.
Thankfully I'll be working with brass and aluminum, both which are easy to machine. I'll be putting together a home anodizing system too, since I don't want any raw aluminum in contact with juice. When I jump into something, I tend to dive in head-first, lol.
I'll definitely make sure and post pictures when I get the prototype put together. I'm hoping to put together a spill-resistant dripper, because I'm also tired of getting juice drips in my pocket with my iGo. I actually can't believe they put the air hole on the iGo directly at the lip height of the inner drip well, so any tipping of the atomizer in that direction results in immediate juice leakage.
It's been a lot of fun though, and has really taken my 'backyard engineering' to the next level.
And thanks for your input. I've read your posts with great interest and you come up with some great stuff. You always give people something else to ponder, and single-handedly spur a lot of innovative thinking.