Here's another one that I just recently used....a coworker was drilling and tapping his exhaust manifold for a computer probe...the problem was that the 'tap wrench' (for those who are not familiar with them) holds the tap in the middle of the wrench. This forms a sort of "T" setup with the top used as the handles to twist the tap, which extends down from the center. Unfortunately there was no room for the tap handle to turn in......the top of the tap was a 1/4 inch square. It would hold the 1/4 inch sockets but we didn't have a way to turn the socket....until....we used the 1/4 inch socket to hold the tap and the socket we used was the one that would hold the screw driver bits. We took another socket handle and socket and used them to hold the 1/4 inch hex bit that turned the 1/4 socket that held the tap....They were careful to maintain the tap perfectly straight and ratcheted the handle in its limited space to get the job done.....