F W I W,
The 2 MT taper can be used to centre the Rotary Table, in horizontal mode, under the spindle of the vertical Mill.
I bought a 2MT arbor with a MYford nose. It has been invaluable carrying work in a 4 jaw Myford type chuck, for turning work in my larger lathe, before transfer to the Mill/Drill with the HV6 with the table vertical, for cutting gears.
Howard