removing a tailstock taper

[TomG]

By its very nature, the screw will eject a drill or center when the quill is fully retracted. Take it apart and examine the length of the screw. It's possible the screw was damaged or modified for some reason that it no longer reaches far enough to contact the tang on MT tapers. The solution is to simply add a pin to the end of it to do the ejecting.

Tom