Surprise gearboxes are available in 35mm or 45mm backset with a single spindle mechanism.
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Single spindles are sprung and can only be used as a lift lever function.
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Surprise gearboxes measure 228mm high by backset +15mm. The latch measures 30mm high, as does the deadbolt. There is 65mm between the bottom of the latch and the top of the deadbolt.
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Gearboxes are fitted to faceplates with 3 screw holes. The top to middle screw hole measures 109mm and the middle to bottom also measures 109mm.
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Earlier versions of these gearboxes also had a small spindle hole at the top of the case, near to the latch. This was used to hold the latch back.
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Operation: Lift Lever
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Latch reversal: Undo the screw in the latch to remove. Reverse and reinsert then replace screw.
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To lock the door
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1. Lift the handle upwards to engage the locking points.
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2. Lock the locking points and main deadbolt (if present) by turning the key.
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To unlock the door
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1. Unlock the system by turning the key.
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2. Push the handle downwards to disengage the locking points and retract the latch.
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