A power tool comprising: a first housing portion; a second housing portion connected to the first housing portion for pivoting motion about a pivot axis; a powertrain having an output member, the output member extending from the second housing portion and being movable relative to an output member axis; a mounting hub; a lock bar; a first set of stop members; a second set of stop members coupled to the lock bar; a spring to cause engagement of the first set of stop members with the second set of stop members; an actuator configured to disengage the first set of stop members from the second set of stop members; wherein the second housing portion is inhibited from pivoting about the pivot axis relative to the first housing portion when the first set of stop members is engaged to the set of second stop members, and wherein the second housing portion is permitted to pivot about the pivot axis relative to the first housing portion when the first set of stop members is disengaged from the set of second stop members; characterised in that: the mounting hub extends from one of the first and second housing portions (30', 32') for movement along the pivot axis; the lock bar is mounted to the other one of the first and second housing portions (30', 32'); the first set of stop members is coupled to the mounting hub; the spring biases the mounting hub towards the lock bar to cause the engagement of the first set of stop members with the second set of stop members; and the actuator is coupled to the other one of the first and second housing portions (30', 32'), the actuator being configured to move the mounting hub away from the lock bar such that the first set of stop members disengages from the second set of stop members. a first housing portion; a second housing portion connected to the first housing portion for pivoting motion about a pivot axis; a powertrain having an output member, the output member extending from the second housing portion and being movable relative to an output member axis; a mounting hub; a lock bar; a first set of stop members; a second set of stop members coupled to the lock bar; a spring to cause engagement of the first set of stop members with the second set of stop members; an actuator configured to disengage the first set of stop members from the second set of stop members; wherein the second housing portion is inhibited from pivoting about the pivot axis relative to the first housing portion when the first set of stop members is engaged to the set of second stop members, and wherein the second housing portion is permitted to pivot about the pivot axis relative to the first housing portion when the first set of stop members is disengaged from the set of second stop members; characterised in that: the mounting hub extends from one of the first and second housing portions (30', 32') for movement along the pivot axis; the lock bar is mounted to the other one of the first and second housing portions (30', 32'); the first set of stop members is coupled to the mounting hub; the spring biases the mounting hub towards the lock bar to cause the engagement of the first set of stop members with the second set of stop members; and the actuator is coupled to the other one of the first and second housing portions (30', 32'), the actuator being configured to move the mounting hub away from the lock bar such that the first set of stop members disengages from the second set of stop members. the mounting hub extends from one of the first and second housing portions (30', 32') for movement along the pivot axis; the lock bar is mounted to the other one of the first and second housing portions (30', 32'); the first set of stop members is coupled to the mounting hub; the spring biases the mounting hub towards the lock bar to cause the engagement of the first set of stop members with the second set of stop members; and the actuator is coupled to the other one of the first and second housing portions (30', 32'), the actuator being configured to move the mounting hub away from the lock bar such that the first set of stop members disengages from the second set of stop members.