Correct, the insulator on the deck under the positive block. This was the same one that was put on wrong when I received it. This is a good picture, Fogger v4 Positive Post Block + Insulator / Authentic Replacement Part / Genuine Fogger v4 Spare Part, you want the center pin going through the sleeved part of the insulator and the flat part going toward the outside of the deck(with the positive screw "nub" going through the flat hole. I'm not too thrilled with this design, IMO that insulator should be identical on both sides. Reason I say this is because it is possible to have the "nub" (where the wire screw is extended) slip off center and contact the negative base of the fogger... especially if the 510 is not sufficiently tightened. As for melting, from what I gather, having 2 coils on either side of the insulator and so close to the deck seems to be the "why". I would assume lifting them higher could help, but that kinda defeats the purpose of 2 coils then :-/"people melt the insulator" thats good to know; with a dual coil i would think that the vapor would be too hot below 1ohm.
i have single, dual, parallel and chimneyed a fasttech kayfun so i dont imagine issues here; but thanks for watching my 6 DAVID1975.
by insulator we are talking about the plastic between the neg and pos connections at the 510 connector (beneath the connection pin)?