Yale YS170 Doormaster Genuine gearbox locks with a 45mm backset. Case Width:Backset + 18mm. Latch reversal: Undo screw in the latch, remove the latch, reverse and reinsert. Split spindle reversal On one side there will be a green coloured part, this is currently the inside of the lock and from this side the handle will withdraw the latch, The side without the green coloured part will only withdraw the latch via the key.
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