That looks a lot like the linkage for an indexer similar to the Capital Indexer, but in the Dillon picture it looks like a solid rod coming off the crank shaft. On the Capital Indexer there is a wire. The wire on the left side of the picture goes up to the crank shaft and hooks to a linkage similar to the one in the Dillon picture.
In any case, it has nothing to do with the Super Star conversion.
Bruce Willaims
PS Although it says its an original Super Star Conversion, it is set up for 45 ACP, not .223.....but it does have a number of Super Star conversion parts.