Thanks everyone for the info and ideas on the threading pattern. I think I will give a try at both solutions, turning a Unimat style pattern and making up a Mert type guide. Can't have too many attachments for a lathe.
While doodling up the adapter and plugs for Mert's threading guide I had the thought that it might be possible to make up a set of guides all with the same OD that screw onto the spindle end. Makes cutting the followers a bit more of a challenge, but thats why I do this.
Art, thanks for the references. Just the discussion I was looking for.
Jan
