His eyes followed Stark's hand as he took his arm, and soon went to his own hand when he realized he was still wearing his HYDRA-issue glove. It was possible it could get in the way, so he shifted to remove it without disturbing Tony's inspection. The arm's sense of pressure was still relatively functional, so he didn't feel the need to stare at the engineer the entire time.

The soldier paused at the question that he couldn't really answer. He had no knowledge of how maintenance was done on his arm, except that... it was done. He only knew that he was to report in after a mission, and if they needed to do maintenance, they did. When it was needed wasn't information he was privy to.

"I don't know," he said. "At least a month ago."