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Message: <blockquote data-quote="Profreedomokie" data-source="post: 3714900" data-attributes="member: 524"><p>This was talked about in metallurgy class I took in 1973 at the Newport News Shipbuilding & Drydock Co. in Va. On one of the early space flights this happened with the hatch/ door. The mating surfaces had the best finish they could machine at the time and when the hatch was opened and then shut back, they couldn't get it opened until it was back on earth. The instructor said it was because it was done in a vacuum.</p></blockquote><p></p>