Here is a link to Stihl manuals, the HT 101 looks like it should help you out.....
Originally Posted by captken
Any words of wisdom?
Here we had a HT 75 and something else that was a Echo drive head but I don't remember what it was, it was a near clone of the HT 75. The Echo thing held up better then the Stihl, but it got caught in a tree one day and got bent out of shape, just to old to repair... The Stihl I rebuilt twice, same problem you have, then it fell out of a tree, cost to much to repair.
What I would recommend is some thing like this, either in a Tanaka or a Echo. It is much lighter and easier to handle.