The Fuhr 859 2 Hooks & 4 Rollers Split Spindle 35mm is a type 19 lock in the 859 series which features a split spindle operation and has 1,247mm between the outer rollers. Insert the split spindle 2/3 of the way in on the internal side and 1/3 of the way in on the external side. To change handing, undo the screw in the side of the lock case adjacent to the latch. Remove the latch, reverse, reinsert and replace the screw.