I have been asked to post up the files for the tenon size jig I designed. This one is 60mm (2.36") and works great on my standard profile jaws HTC125 chuck.

I developed this in FreeCAD to help finish and turn spheres and to use my tailstock as a press to glue accents on to other wood turned projects. You can follo w me on YouTube (@tonyturnswood) for more turning ideas and fun.