Pretty sure the reason they remove the catches is so you can't set it on then go back in the car and pick up a static charge and then go back to the nozzle and get a static spark causing a fire.

Chance of it happening are pretty slim but it has happened as seen on every one of the caught on camera disaster shows. Guess in the world of public liability no one is prepared to take a chance anymore.

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Stoner & Webber 2011 World Champions