Better late than never, I finally got my hands on one to check out. Honestly the castings and machine work are beautiful.
Here are a couple pictures with my guess to how it works. The water marks are my little fuck you to VS.
Cover off, spring out shows the bolts holding the spider on, and holes that the weights come through
Plastic washer that spring cover hits at full shift, to keep sheaves from wearing on each other
Spider off, shows the snap ring that the plastic washer rests on, and the steel nut that retains the idler bearing, and gives the spider a place to bolt to
Closer view of the spider, the buttons are in their own little carrier, that rides on a pin, retained by a roll pin
Bottom view of the spider, the carrier for the buttons is free to move on its pin, and the rollers are easily changed by removing a small retaining screw
And a close up of the moveable sheave showing the casting rib that the weight notch goes around
The weight, washers, retaining screw, and pin. The bushing, and roller surface are quite wide. Notice the notch to clear a rib in the moveable sheave. This clutch is off an 800, and runs a 66g weight. The pivot pin is further from the crankshaft, allowing a lighter weight to apply the required force.