Funny how you say that I just got off the phone with a guy who sells half round rasps and he told me that the blades on the edges of the half round rasp burn out easily. A round rasp on the other hand will be really handy. I mean I can always work at it with my hands rather than a machine as long as I could see the material pealing off lol. So at the moment I am looking for round rasps which 400mm long lol. Thanks for the advice though