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Simple. He fixed the helmet.

They were 3 years apart after all.

Or, he "borrowed" a new helmet (or entire suit) from the Pentallian in "42". Both "The Satan Pit" and "42" took/will take place in the 42nd century, so it's reasonable that the spacesuits were/will be of the same make. (In real life, the same prop was used.) 22:28, May 28, 2011 (UTC)