Replacing your clutch at home isn't exactly a beginner-level job. You've gotta drop your driveshafts, remove your T-case, unbolt your bellhousing, and carefully remove your transmission. After sending ...

And it worked. But it set spacewalkers so far behind that they couldn't get all their tasks done. Atlantis astronaut Michael Massimino couldn't remove one bolt attaching a hand rail to the outside of ...