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Union numbered keys cross-reference

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Does anyone have a way of determining key bitting from numbers stamped on levers?

 

SKS managed to send a lock out to me this morning without any keys (lock, faceplate and presumably at some point keys all in an open cellophane bag). I had a devil of a job getting them to simply supply me with the number of the pre-cut key from the levers - they wanted to send me a new lock for tomorrow when I had a wall of Union keys and the customer waiting for his pre-ordered lock.

 

Thought in future would be simpler to be able to do the look up myself.

 

Thanks

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Your probably correct I made the chart by measuring the keys and the levers many (too many) years ago.

Grahams chart is from the Souber key and reader kit and should be more accurate than mine :-(.

DC

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Any ideas how one would cross reference the levers (numbered 153) on a 2077 Horizontal union 3 lever mortice lock? Sorry if this is an easy one to resolve. It's NOT M153M sadly...

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