STS057-30-021 (21 June-1 July 1993) --- Astronaut Brian Duffy, pilot, handles a soldering tool onboard the Earth-orbiting Space Shuttle Endeavour. The Soldering Experiment (SE) called for a crew member to solder on a printed circuit board containing 45 connection points, then de-solder 35 points on a similar board. The SE was part of a larger project called the Tools and Diagnostic Systems (TDS), sponsored by the Space and Life Sciences Directorate at Johnson Space Center (JSC). TDS represents a group of equipment selected from the tools and diagnostic hardware to be supported by the International Space Station program. TDS was designed to demonstrate the maintenance of experiment hardware on-orbit and to evaluate the adequacy of its design and the crew interface. Duffy and five other NASA astronauts spent almost ten days aboard the Space Shuttle Endeavour in Earth-orbit supporting the SpaceHab mission, retrieving the European Retrievable Carrier (EURECA) and conducting various experiments.