one "tool" that I have found indispensable working on bikes is a flat mountain bike handle bar. The one I use is aluminum but steel works just as well. The open end slides snugly over my socket wrench handle giving me a 2 ft lever to torque down bottom bracket spindle bolts or loosen really tight axle nuts. Slid over a hex wrench it makes loosening or tightening quill stems easy. I cut mine down a couple inches so it fits in my tool box so I always know where it is when I need it.