Yep the igo w3 is a 5 post(center is negative). I had originally hoped to do quad coils but with the post whole size , overall deck size and fact that I only had 22 ga wire ( I do have a little 28 ga but I'm not a fan ) the dual sleeper is what worked. I am running through the center post.Looks like his RDA has 5 posts and he just has the screws out of some of them, not sure which ones are positive