Dave Sr. from SWISCO responded:
February 18, 2016
I believe you are correct. Your installation hole is off centered like the 40-129, while the 40-123 hole is centered in the key cylinder. Looking at you photo, it appears your lock is closer to the 40-129. It's possible you could have a different series handle that takes the this cylinder. There are many, many types of door handles that look similar and are made by the same company, but have tiny, subtle differences like this.
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