The new Upper-Arm with the Mini-Hub instead of the Bike-Hub.
The Mini-Hub provides
a dramatic reduction in weight and size. This small hub
has two bearings, so it will provide
smooth motion. In fact, the bearings are from a bike-shop.
If one took a bike hub and removed
all the outer shell, you'd end up with 2 bearings and a shaft.
This Mini-Hub is effectively that,
except I didn't destroy a good bike hub.