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[Cue Crazy]

Are you talking about dead center wobbling when you chuck up on it? If so, it sometimes takes several attempts to get it running true due to the small O.D. of the dead center. I made a larger O.D. dead center for mine (.800" )and that made it much easier. Chris told me the jaws are cut at 1.375" radius if I recall correctly.
John

That seems to be the case for me also. Larger shanks chuck up easier then the smaller ones. I have a larger shank mandrel around that same dia., and It chucks up true the first time, almost everytime. Maybe I should make more centers like that for mine. Greg C