Bob Blandford did this really good video that shows how to make a one piece pen. I've done it a couple of times with pretty good success.
Walter Hall did a piece on modified slimlines for Woodturning Magazine once upon a time I seem to remember. I don't know if it ever became publicly available or if there are copyright restrictions on it. But hopefully [MENTION=95]Walter[/MENTION] will pop along shortly to give us the gen, and maybe give us a link