From a commission request. The staff itself is a standard dowel rod from Lowe's, 1.25" diameter. I've included both models with the adapter already fixed to the skull and the adapter by itself for your to join in the slicer if you wish to resize it. I would recommend printing a short cross section of each piece to make sure its sized correctly to the dowel rod you select and scaled to fit.
FreeCAD files available in download.
The author remixed this model.