The mischieveous (sp?) spirits which sometimes occupy rotating pieces of wood are entranced by the unexplainable hole in the tool rest. As long as they are distracted they are unable to gang up on you and cause a catch/ dig in / explosion.
Make sure you keep that hole clear and clean. Applying a little Internation Orange paint around both sides of the hole will make it more effective. The evil spirits trying to get into your turning will take their eye "off the ball" and fail to enter the turning at the centerline of rotation, thus skipping harmlessly ofd it. You should wear safety glasses though because the last thing you want is to have one of those evil spirits to get in your eye. You have heard of "the evil eye" right?
There's very little on a good machine that's not there for a reason, albeit an obscure reason.
charlie b