A tripartite microsealing mechanism was a particularly complicated type of lock.
Rom concocted one of his "special security locks" using this type of mechanism in 2372 to guard the bar while he and Quark visited Ferenginar. Unfortunately, Chief O'Brien and Doctor Bashir's dart board was locked inside, and they attempted to dismantle the lock rather than replicate a new board – though they both denied their old one was lucky. Of the lock, Odo observed, "I've never seen anything so convoluted." (DS9: "Family Business")