A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.

A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.

A retention assembly for connecting a base to a tool having a shaft includes a shaft engagement socket defining a shaft receptacle configured to receive the shaft; a retainer configured to secure the shaft to the shaft engagement socket, the retainer having a body with an opening that can receive the shaft; and at least one finger extending from the body, defining a sliding surface, and being configured to contact the shaft. The sliding surface can contact a ramp on the shaft retainer socket, and the retainer can translate relative to the shaft engagement socket, such that when it is translated toward the shaft engagement socket, the sliding surface slides along the ramp and causes the finger to move away from the shaft, and when the retainer is translated away from the shaft engagement socket, the sliding surface slides along the ramp and causes the finger to move towards the shaft.