I have a question about rasps. I find that when I use a rasp often time I am gripping the "business" end with my left hand while pushing with my right. However, this isn't terrible comfortable and has resulted in a few bloody left fingers. The rasps I am using are the Nicholson 49 and 50, so not an Auria but also not the bottom of the heap. Why have I never seen a two-handled rasp? Am I using it incorrectly?