Check the forum index at the top of the main page. There is a link on the left side of the page I believe to a "How-to" on tuning the 2200. The 2200 is the now discontinued .22 caliber version of the 2100/77.
Edit: Was finally able to get to the index page, so here's the link...
http://www.network54.com/Realm/CFTech/FB2200.htm
I plink, therefore I am.