I learned that you have line up to start by the two markers near the punch bit. I did not even realise they were there. Then it is important to line up exactly against the guide even a tiny bit out will cause it to go stray. And the oval has to first do the first punch in the usual way then line up against the oval guide opposite for the second punch, then use the oval guide at the side for the punches between. Simples! (When someone shows you how to do it!)