I have tried other versions of these and never liked them much. Reason being it was difficult holding everything in place while you turned the tailstock wheel. This new model eliminates all that frustration because the one end is spring loaded. That's a game changer. I love this one. Only drawback to it is the plastic part has a hole in it, intended to hold the pen nib. Sometimes that's good, sometimes it's not. My solution was to just make a hardwood sleeve that slips over it, when needed.