If I were buying a clock case I would not buy one containing a movement that struck thirteen, no matter how beautiful it was.
If the purpose for the clock in the case was simply to show that yours would fit, would you still be having a conniption fit over the fact that the clock wasn't keeping good time?
The purpose of the tutorial was not to build a Morse code transmitter and receiver (clock in pretty case). It was to teach you how to create a library (the pretty case that the clock came in). If you don't like the resulting library, it is now your library. Fix it. Or throw the stupid clock away and use your own in the pretty case.