There may come a point when indexing factors of 24 with the VDH Basic Head no longer meets your needs. Perhaps gears must be cut or complicated graduations must be struck. Armed with this Upgrade Kit, the VDH will divide anything with infinitesimal accuracy.
This addition to the VDH, will allow you to drill the 3 Division Division Plates (blanks included) with near perfect accuracy. Of course you'll also need a few undistracted hours!
The "Basic to Full Upgrade Kit" contains all of the additional material and drawings to convert the Basic VDH to the Full VDH.