Quote Originally Posted by mactec54 View Post
Not if you know what to do they are very easy to indicate, either with a round disc for the indicator or a feeler gauge mounted in the tool post of the lathe, this is spring loaded onto the Ballscrew then the indicator can run on this

No sleeve needed
nice trick with an aggressive lead screw. but an aluminum sleeve still acts like a set of soft jaws and is extra protection for the screw. so it becomes a matter of preference based on particular needs. the 5 mm pitch screws are not that spacious for indicator work. what ever works i say as long as things are concentric that's the part that matters most.