A power tool comprising: a structure; a flywheel coupled to the structure; a driver that is translatable along a driver axis; and an activation arm assembly having an actuator coupled to the activation arm assembly, the activation arm assembly being coupled to the structure and including a roller assembly having a first roller and a second roller, wherein actuation of the actuator causes the roller assembly to translate toward and engage the driver to initiate driving engagement between the driver and the flywheel; wherein the activation arm assembly further includes a carriage, the carriage being fixedly coupled to the structure, the actuator being mounted on the carriage; wherein the activation arm assembly further includes a first axle and a second axle, the first axle being received through a pivot slot formed in the carriage, the first axle being coupled to the roller assembly, the first roller being mounted on the first axle, the second axle being coupled to the roller assembly, the second roller being mounted on the second axle; and wherein the activation arm assembly further includes a follower arm that engages the roller, the follower arm including a first mounting portion (80, 82) and a second mounting portion (84, 86), the second mounting portion (84, 86) being pivotally coupled to the actuator and slidingly engaged with the carriage, the first mounting portion (80, 82) being biased in a direction toward the driver; wherein the actuator is a solenoid which has a body and a plunger, the plunger being movable along an actuator axis that is generally parallel to the driver axis; characterized in that one end of the follower arm has a recess with a first recess portion forming a first surface angle (alpha) with respect to the axis of the solenoid and a second surface angle (beta) that is angled with respect to the axis of the solenoid, the first surface angle (alpha) being greater than the second surface angle (beta); wherein, when the solenoid is actuated, the roller assembly travels the first recess portion (alpha) to position the roller assembly in close proximity to the driver and then travels over the second surface angle (beta) to provide a mechanical advantage that pushes the driver into the flywheel to initiate a drive sequence. a structure; a flywheel coupled to the structure; a driver that is translatable along a driver axis; and an activation arm assembly having an actuator coupled to the activation arm assembly, the activation arm assembly being coupled to the structure and including a roller assembly having a first roller and a second roller, wherein actuation of the actuator causes the roller assembly to translate toward and engage the driver to initiate driving engagement between the driver and the flywheel; wherein the activation arm assembly further includes a carriage, the carriage being fixedly coupled to the structure, the actuator being mounted on the carriage; wherein the activation arm assembly further includes a first axle and a second axle, the first axle being received through a pivot slot formed in the carriage, the first axle being coupled to the roller assembly, the first roller being mounted on the first axle, the second axle being coupled to the roller assembly, the second roller being mounted on the second axle; and wherein the activation arm assembly further includes a follower arm that engages the roller, the follower arm including a first mounting portion (80, 82) and a second mounting portion (84, 86), the second mounting portion (84, 86) being pivotally coupled to the actuator and slidingly engaged with the carriage, the first mounting portion (80, 82) being biased in a direction toward the driver; wherein the actuator is a solenoid which has a body and a plunger, the plunger being movable along an actuator axis that is generally parallel to the driver axis; characterized in that one end of the follower arm has a recess with a first recess portion forming a first surface angle (alpha) with respect to the axis of the solenoid and a second surface angle (beta) that is angled with respect to the axis of the solenoid, the first surface angle (alpha) being greater than the second surface angle (beta); wherein, when the solenoid is actuated, the roller assembly travels the first recess portion (alpha) to position the roller assembly in close proximity to the driver and then travels over the second surface angle (beta) to provide a mechanical advantage that pushes the driver into the flywheel to initiate a drive sequence.