But isn't this the same machine that had a mystery shudder In the headstock every third revolution or something? And some problem in the carriage? And left weird marks in the work? And is now turning a .005" taper over 4 inches? My memory isn't that great, which is why I ask. With all these mysterious and unresolved problems stacking up, I wonder if there's a good way to solve them. Generally we try to eliminate the variables as they are identified, in order to narrow in on the root cause. But the list of variables here is only getting longer.