did someone say driving?
Here is what I use
Variable voltage eGo/510 USB Passthrough
That was the FIRST site that had them, although I got mine from madvapes
My telescoping Zmax does not have a rattle that I can detect.
I had planned to get the Zmax V2 because I don't care for the look of telescoping and plan to use only an 18650 batt, because I'm a chain vaper!!! dammit!

As usual, all the research and reading I do, just leads me to more questions.
Does anyone have an issue with the attys not sitting flush with a Zmax?
Should I consider a 510-510 connector to protect the threads and will that just make the atty sit even higher?
ACCKKKK! So much I don't know!
