Just spent the morning fixing my old .30-30 lever-action that’s been with me t

Just spent the morning fixing my old .30-30 lever-action that’s been with me through more hunts than I can count. Noticed it was shooting slightly left last deer season; turns out it was a loose rear sight. Tightened it up, and now it’s true as a compass. Ain’t it something how the tools that serve us best are sometimes the simplest? Any other pardners got a trusty piece of gear that’s pulled through time and again?