Here is a birch root staff that stands 71" tall. It doesn't have a full "cradle" that would support a sphere on all sides but it does have a nice "elbow" root that holds a ball nicely. The dog ball pictured(not included) is about 4" round and it was slightly squeezed in. I think a 100mm stone would fit if a little wood was removed. The shaft is a nice size, about 1-1/4" on the small end and 1-3/4" on the large. The shaft has a few jogs in it buy it is relatively straight. It weighs 2#13ozs and will ship in a 72" x 8" x 8" box (though I might be able to add a knock down joint to reduce shipping). This is a raw material, the bark was stripped with a drawknife and nothing else was done to it. (ufws330)