Insulator looks perfectly fine, which is what's confused me! But whenever I go to put it on the mod it forces up the centre pin
That was happening to me as well. My fix for itwas epoxy. I just dabbed some around the insulator and jammed the positive pin back in. Viola, problem fixed! I let it dry for an hour but the heat from the coils did a great job bonding the plastic to the metal. I've had it for a few months now with no problems.
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