Tom, the difference in the neck of the banjo that came with your G0766 and the Oneway banjo, is that the Oneway banjo is 1" taller in the neck than the Grizzly banjo.
The hole depth in the Grizzly banjo from its top down to the bar that locks it down is 3-1/4" deep, which would give one a fairly good amount of height adjustment I think. The 1/4" added to my 8-3/4" total height would probably not make much difference, but I have had good success with lower positions with my 8.75" total height and plenty of post in the hole to make it stable. Not once have I ever had a problem with stability of the tool rest with the 8.75" total height. Hope this helps!