Reminds me of a guy I knew when I was working in the boat building trade producing ocean-going yachts. All the deck winches come with templates which are generally taped in place to the deck and you drill the necessary holes right thru the paper and thru the teak and grp deck. Anyway, he thought it would be a good idea to take a photocopy of the template and keep the original aside in case he ever got a winch without the template inside.
So he got it photocopied and placed the copy on the deck and drilled these holes thru the yacht's teck deck. Then discovered the bolt holes he had drilled didnt align with the bolt holes in the winch body. Much head scratching, not to mention the Foreman's wrath, then the reason was uncovered.
When photocopying he hadn't noticed that the copier had been set to a 10% reduction mode by the previous user and not been reset. So of course his copy, and dimensions, were 10% shorter!
Perhaps in the ERA production dept, some office girl simply photocopied the templates in this batch of locks at the wrong setting. Maybe there are thousands of them out there in the market with the wrong size templates.....
regards