How to reverse lock handing (600 series) To change the handing from right hand to left hand or vice versa. Method With lock in unlocked mode, Remove lever housing &a bolt/lever assembly from lock case. Dismantle lever pack. Lay out levers, Noting that the levers next to the bolt must be replaced to the same position when reassembling. Reverse bolt to opposite handing &a reassemble levers in unlocked mode.