I'm surprised that so many of you have trouble with tips mushrooming. I've played pool since I was 11 and I don't think I've had it happen before. Maybe because I've never played with particularly soft tips. I just usually shape and burnish once in a while to keep it in shape. On a related note I've been looking at the Willard tip machine for replacing tips. I know it's expensive but might be cool to do tips for people. Does anyone know if it works with shafts under 12 mm though?