[patrija]

OK, assuming it's the round assembly (think I confimed that on the holley website), I removed the black pastic cap. It was held on by two metal clips.

I couldn't find a brass piece. The rotor turns about 1/2" counter clockwise.

>> OK ... removed the plastic piece on top of the rotor, and under it was the brass piece. The rotor turns about 1/2" ccw, but the brass piece does NOT turn with it.

Took two pics if the help.