These are the two that I have. Both are JLW shafts, the short one is the 'original' and the other is a replacement hollow, long shaft (20mm longer).
From the bottom of the rim to the end of the stick it is 35mm (this includes the little bit for the snap ring). The diameter if the lower is 8.97mm on both (The original, the 'hub' at the bottom is narrower for some reason at 8mm which is somewhat relevant to the ultrastik 360 as it has an inset magnet that has a hole that is 8mm inside and uses that.)
Upper shaft on the original is 11.87mm, upper shaft on the 'long' version is the same as the lower at 8.97mm (The ring itself is 12mm on the dot outside diameter).
10mm threads on the original, 6mm threads on the 'long' version.
Overall lengths are 82mm and 102mm respectively.
Seems like these don't