A power tool comprising: a housing assembly; a motor received in the housing assembly; an output spindle; a transmission configured to transmit rotary power between the motor and the output spindle, the transmission including a rotatable output member; a spindle lock assembly configured to transmit rotary motion from the rotatable output member to the output spindle when the rotary output member is being driven by the motor and configured to inhibit transmittal of rotary motion from the output spindle to the rotary output member when the output spindle is being driven by an external force, the spindle lock assembly including a first rotatable part fixedly connected to the output member, a second rotatable part fixedly connected to the output member (40$ and operatively engaging with the first rotatable part, and a lock ring surrounding the first rotatable part and the second rotatable part, characterized in that the lock ring is retained to the housing in a substantially stationary manner with at least one dampener disposed between the lock ring and the housing and configured to dampen movements of the lock ring relative to the housing in a rotational direction; wherein the lock ring comprises a radially outwardly extending projection received in a recess in the housing, with the dampener disposed between the projection and a sidewall of the recess, wherein each recess is slightly wider than the corresponding projection so as to permit a small amount of rotational movement between the lock ring and the housing, the small amount of rotational movement being damped by the dampener; wherein the dampener comprises a first dampener disposed between the projection and a first sidewall of the recess to dampen movement of the lock ring in a clockwise rotational direction and a second dampener between the projection and a second sidewall of the recess to dampen movement of the lock ring in a counterclockwise rotational direction, the lock ring being able to undergo a small damped rotational movement due to the compression of the dampeners in either the clockwise or counterclockwise direction. a housing assembly; a motor received in the housing assembly; an output spindle; a transmission configured to transmit rotary power between the motor and the output spindle, the transmission including a rotatable output member; a spindle lock assembly configured to transmit rotary motion from the rotatable output member to the output spindle when the rotary output member is being driven by the motor and configured to inhibit transmittal of rotary motion from the output spindle to the rotary output member when the output spindle is being driven by an external force, the spindle lock assembly including a first rotatable part fixedly connected to the output member, a second rotatable part fixedly connected to the output member (40$ and operatively engaging with the first rotatable part, and a lock ring surrounding the first rotatable part and the second rotatable part, characterized in that the lock ring is retained to the housing in a substantially stationary manner with at least one dampener disposed between the lock ring and the housing and configured to dampen movements of the lock ring relative to the housing in a rotational direction; wherein the lock ring comprises a radially outwardly extending projection received in a recess in the housing, with the dampener disposed between the projection and a sidewall of the recess, wherein each recess is slightly wider than the corresponding projection so as to permit a small amount of rotational movement between the lock ring and the housing, the small amount of rotational movement being damped by the dampener; wherein the dampener comprises a first dampener disposed between the projection and a first sidewall of the recess to dampen movement of the lock ring in a clockwise rotational direction and a second dampener between the projection and a second sidewall of the recess to dampen movement of the lock ring in a counterclockwise rotational direction, the lock ring being able to undergo a small damped rotational movement due to the compression of the dampeners in either the clockwise or counterclockwise direction. wherein the lock ring comprises a radially outwardly extending projection received in a recess in the housing, with the dampener disposed between the projection and a sidewall of the recess, wherein each recess is slightly wider than the corresponding projection so as to permit a small amount of rotational movement between the lock ring and the housing, the small amount of rotational movement being damped by the dampener; wherein the dampener comprises a first dampener disposed between the projection and a first sidewall of the recess to dampen movement of the lock ring in a clockwise rotational direction and a second dampener between the projection and a second sidewall of the recess to dampen movement of the lock ring in a counterclockwise rotational direction, the lock ring being able to undergo a small damped rotational movement due to the compression of the dampeners in either the clockwise or counterclockwise direction.