stainless:
Hopefully, Scott ("FLORK") will be by with an explanation, but knowing the Apex gang, it's probably more reliable. You also get to watch Randy's "how to remove an extractor" video, and learn how to break a punch.
(Maybe they have Lisa drop it off if you're close by, too.)
Probably a description on their web site.
Found a note elsewhere the other night to the effect that you should replace the (otherwise hard to remove) pin with a roll pin of the proper size, if possible. Much easier to work with, and it should work just as well.
Regards,