HighwayPretzel, Welcome to the group. I hope you enjoy your time here.
As HiBC was saying all the parts should be there to make the change.
Push the cup down and compress the spring, expose the hex head which is the post and most likely a different size for each primer cup. With the cup pushed and the hex exposed you should be now able to unscrew the post.
The spring will be used on both sizes while the posts and cups get changed out.
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