An embarrassing concoction of a bent staple, and raw wire.

I highly DON'T recommend it - I just happen to have done enough donking around with this kind of thing in the last 25 years to be able to come up with some reasonably stout connections this way.
Since it is working, and I like it this much... I will be making an actual mod next week that would be much better suited for this purpose. I am working on a universal adapter actually that you can just pop any atty onto and go to town. Just a bit tricky with all the different designs.
I would recommend just taking an old kr8/901 battery connector, hooking yourself up a good USB cable through a battery box or similar item with a momentary switch, mount the connector onto the box, and then vape away with your carts!
Lots of DIY walkthroughs on USB passthroughs in the mod forums, but I'd be happy to answer specific questions if you'd like.
Take care,
- Hap