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Tell the company you will buy the shipment with the wrong engraving for half price.
Won't be hard to flick them on given the popularity on here ;)

Use the "advanced" function Rushy and there is a button you can push to do the job.

You will want to allow a few extras as well for the people who go "I know he said not to bone with it but it won't hurt to try . . ." ;)