The center post of the Igo-W and Igo-S can be taken off completely by pushing it down and
through the 510 connector.
When you do this, 2 insulators are inside the base holding the post. The one on the bottom of the base (that you can see when looking
through the 510 connection) is the one you modify. It's in there, so take a small screwdriver and just take it off. It's not rubber, but like, a soft plastic? Thin enough to cut a slit in it. You can use scissors OR even better, try some nail clippers. I cut off maybe 1/32" of it off leaving a nice slit in it.
That SECOND insulator, take it off the atty if it's still in. This one, I believe is used to hold the center post from touching the base. With that being said, don't hate me if I say I never put mine back on. I've never had a problem with it shorting on me and I use and abuse both the Igo-W and Igo-S.
I'm sure you can cut a slit similar to the one you did on the bottom insulator and line them up.
Now just put your center pin back
through the 510 connector with the insulator(s) and the final test.........
Blow through your 510 connector. POW!!!
It actually works GREAT!
I find myself using my Igo-S over the W, only because of the smaller space inside the chamber. The tighter the space, the greater the flavor.
Hope this helps...