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The 859 series features 2 hooks 4 rollers and split spindle nightlatch operation.
Backset: 35mm.
Centres: 92mm
Operation: Lift lever or split spindle nightlatch.
Latch reversal: Undo the screw in the side of the lock case adjacent to the latch. Remove the latch, reverse, reinsert and repace the screw.
Night Latch reversal: 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
