You need to push the pin further in to the ceramic. I'll set my Diver on the table upside down (with the top of the ceramic touching the table) and with gentle yet firm pressure push the pin down with a small Phillips screwdriver (like for eyeglasses, etc). The bottom of the ceramic cup needs to be seated tightly for the negative wire to make contact and the bottom of the pin should be about flush with the 510 connector.
Don't give up yet. It's really not hard to get it set up, and when it's set up properly it works great.
Don't give up yet. It's really not hard to get it set up, and when it's set up properly it works great.