Well here is a link to a post on another forum that contains part of the website that explains the extractor adjustment. It worked on one of mine but does have a risk of breaking the extractor.
The link below has a copy that can be downloaded. Not sure how long that document will remain. In support of the copyright laws I won't copy and paste it here. I'll continue to search for the rest of the information that was contained on that website and post as I find it.