Not always on several counts. Many fuel fittings on pressurized gas, and sometimes just proprieatry "stuff." At least the older Makita drills had a LH thread screw down inside the chuck to lock it to the shaft. We used to use those shortie double ended 1/8 bits for sheet metal. Some of the guys were not careful, and would get the thing in too deep and not tight enough. If the bit spun in the chuck, it could loosen the screw, "like an easy out" or at least "screw" it all up!!!