Ditto what Vaughn said. I have never made a tenon yet long enought to get back to the serrations. Also I bought a dovetail tool. Then I made one out of a old scraper. Here is the one I bought and used for a copy. You must make sure the dovetail fits tight and that the chuck jaw faces seat firmly against a flat shoulder or you could have troubles.
Retirement: That’s when you return from work one day
and say, “Hi, Honey, I’m home – forever.”
To succeed in life, you need three things: a wishbone, a backbone and a funnybone.