The 859 series features split spindle nightlatch operation. Type 1 refers to the 4 roller version of this lock.
Operation: Split spindle.
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.
- Centres: 92mm
- Case height: 195mm
- Case depth: Backset + 18mm
- Overall length: 2170mm
- Distance between outer rollers: 1510mm
- Distance between inner rollers: 699mm