The 859 series features split spindle nightlatch operation. Type 1 refers to the 4 roller version of this lock.
- Overall length - 2170mm
- Distance between outer rollers - 1510mm
- Distance between inner rollers - 699mm
- Undo the screw in the side of the lock case adjacent to the latch. Remove the latch, reverse, reinsert and repace the screw.
- 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.