This is pretty simple.
There are two 3/26th holes in the rim. One for a magnet
that activates the Hall Effect sensors and the other
for a brass balance weight. Both epoxied in.

The bolt pattern is yet to be determined as it is not
symmetrical. I just don't have a 10 mm socket
here :)

This goes on the front of the e-shaft on top
of any pulleys.

Paul Lamar