A method for mowing around an obstacle. A mower arm is pivotally connected to a supporting member supportively connect to a supporting vehicle. A pivotal arm is pivotally connected to the mower arm. A cutter head is connected to the pivotal arm, the cutter head comprising a first cutter and a second cutter. A release mechanism comprising a holding plate is located on the pivotal arm and an actuator is located on the mower arm, the holding plate comprising at least one hole, the actuator engaging the at least one hole in the holding plate to hold the pivotal arm in a first position such that the first cutter is in a relatively leading position to the second cutter.