Good topic; most of us that fly really can’t afford it, so getting back to home base where you can repair and clean is a must. Lots of tools out their are multipull use units, all good posts, but I have found if you carry it you will never need it. I carry and all of you have seen them,a canvas tool bag, the Crus tool kit is great, but often several components are totally useless. I fly a Champ 7AC and built a few of them. Probably the simplest Plane you can tool bag for. But so is a small Cessna. Altoids gum those metal tin cases are a must. To store o-rings cotter pins, safety wire ,AN Hardware,I even carry a very small grease gun, a new spare spark plug,quart of oil,8oz,mouse milk bottle with 5606. can of solvent spray, to clean, rags,and small wrenches up to 1 inch.short ratchet screw driver use an altoids to carry all those tiny bits, for that driver.dykes flat nose plyers, Personally I’ve never broke,but I am a local flyer, but my kit has helped several other pilots in need. Mostly at fly inns. And believe it or not It’s usually fuel leaks that I’ve delt with and bearings,