[Twitter Tools] How do I force Twitter Tools to re-send a tweet?

How do I force Twitter Tools to re-send a tweet to Twitter? There doesn’t seem to be an option to “tweet on Update” or anything like that (which I would think should be added as many of the other tweet plugins do it).

I think I can mess with the two custom fields, but I can’t seem to figure out what to do to get it to go.

Thanks!