So the stylus keeps popping out of the bevel while tracing frames if there is any tilt at all. Having to trace one eye at a time, positioning the frame in the least difficult position. I see that the tip of the stylus is worn flat. Anyone else had this problem? Is there a solution short of buying a new stylus? How about filing the tip back to a rounded position? Don't want to ruin the stylus yet, right? Thanks in advance for any helpful input.