The 859 series features split spindle nightlatch operation. Type 1 refers to the 4 roller version of this lock.
- 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.
- Overall length – 2170mm
- Distance between outer rollers – 1510mm
- Distance between inner rollers – 699mm
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