This is one of my best selling pens/pencils in that size range... and the real upside is that you don't need a separate kit for the pencil, just the mechanism....
It does not require a tenon, but it does require you turn down the blank to the tube to fit the centerband, not at all hard, but you need to be accurate with the length... if you are going to do these kits, I do recommend buying the cap gauge... it gives you the correct measurements for the PF, DT Euro and the Flat Top American... worth the couple of bucks it cost...