Hey Ryedan, let me see if I am getting this right...
I would need to drill a hole in the +post on top, through the pin in the bottom of the Igo-L, and also the side of the 510 adaptor that I would be using? Will I still need to use an o-ring under the Igo-L at the top of the chassis? I ask all this because I just put the Igo-L in an unsealed adaptor on my XL just to see if it would fire, and it does. It also fits snug on top of the casing as well. I have been vaping my Igo-L on my Natural mechanical lately and have really been enjoying it. I would love to be able to use it on my XL at some point...
You may not have to drill the side of the 510 adapter. It depends whether or not the edge seats low enough to cut off the feed and seal the bottom chamber off. On mine I didn't have to. It varies from chassis to chassis..