Addressograph Bartizan 4850 Manual Credit Card Imprinter

I've never used a credit card imprinter before purchasing this one. Some of the numbers are hard to read, especially the expiration date. I have to check the imprint closely to make sure I will be able to read them. Then I have to write over the unreadable numbers with a pen. I used to write all the credit card information by hand. I wanted the imprinter to eliminate all the time I was spending writing the info, but it hasn't worked out the way I expected.