What a great time with your grandson, Walt! You've created a wonderful memory for him, one that he won't fully appreciate for many years to come probably, but that's OK. Excellent!!
I was thinking exactly the same thing. When I was a teen and my grandfather was showing me how to fix a boat motor or water pump or something, it wasn't that important to me. I now look back on those moments with such a strong sense of nostalgia, I can't even tell you. And if he had ever showed me how to shave with a straight... well, I would be cherishing that forever. You've given him something really, really special, Walt.