A mud mixer comprises a housing defining a battery mounting portion, an electric motor supported by the housing, a mixing element that selectively receives torque from the motor, causing the mixing element to rotate about a rotation axis, and a battery pack removably coupled to the battery mounting portion for providing power to the electric motor when coupled to the battery mounting portion. When the battery pack is coupled to the battery mounting portion, the rotation axis intersects the battery pack.

An adapter is arranged to secure to a rotary device. The adapter includes a handle rotatable about an axis, and a coupler extending from and coaxial with the handle. The coupler is adapted to engage the rotary device via traction elements for simultaneously rotating the rotary device and the handle.

An apparatus is provided for mounting to a work tool shaft to facilitate and reduce stress in the use of the tool. The apparatus includes a mounting portion adapted for receiving the work tool shaft and a handle mounted to the mounting portion. The handle includes an elongated portion offset from the work tool shaft and adapted for gripping by a user of the tool. The handle elongated portion is disposed, at least in part, intermediate the mounting portion and the work tool head and is substantially in line with the tool shaft. The mounting portion is adapted so that it can slide along the work tool shaft when no leverage is exerted on the handle and can firmly hold the work tool shaft when leverage is exerted on the handle. An adjustment assembly is provided for adjusting the sliding resistance of the mounting portion on the work tool shaft. A brake is adapted to hold the mounting portion in a fixed position along the length of the work tool shaft when leverage is applied to the handle and to allow the mounting portion to move along the length of the work tool shaft when the leverage is removed.

A mud mixer includes a tool body, and an electric motor supported by the tool body that is configured to rotate a mixing element about a rotation axis. The mud mixer further includes a first handle fixedly coupled to the tool body and extending from the tool body along a handle axis, a plane angled relative to the rotation axis and defined as an extension of the handle axis, and a second handle rotatably coupled to the tool body about the rotation axis and extending from the tool body in a direction parallel to the plane.