Unbend a paper clip or get a very small screwdriver and raise the center pin very slightly. This can happen if you screw it on the tank or even the charger a little too tightly.
Be very careful and don't try to raise it too much. If you still have a problem maybe pick up an adapter.
I've been having center pin problems with a couple of my Twists too. Do what others suggested but be careful. One I went a bit overboard trying to work the pin up and it's pretty loose, needs to be adjusted every time.
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