The exacto knife method worked until Koford changed the comm design. The slot is now smaller on X12 arms. I haven't found the right tool yet to clear out the narrower slot. When I am done cutting a comm, the edge is kind of ragged looking. What do I do? Am I doing somthing wrong? I am resisting the pen method that I used to do. I do use a blast of compressed air after squirting naptha on the freshly cut comm.