This is a picture of the stamp unit used in the old days along with one of the number pins it held. Once the numbers are installed, there is a safety pin like wire that holds them in. You can see it on the stamper. Hard to see how the numbers would get out of alignment. Look at the Tonawanda stamp. Nice and straight.
http://good-times.webshots.com/photo...01686729EWMNUp
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.