Yale lock setback?

I need to source a replacement Yale night latch, so could someone please advise from where to where the setback of the lock is measured - so I can match it?

Reply to
Harry Bloomfield
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From the edge of the door to the centre of the cylinder hole.

Or, to put it another way, from the edge of the door to the centre (midline) of the keyhole.

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Reply to
Dave Osborne

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very much..

Reply to
Harry Bloomfield

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