Like he said...

A better option is if you can, use the computer radio to set the end point adjustment ( or range of travel ) to take the servo to it's extremes...

e.g. 150%

That will give you more movement of the control surfaces w/o needing to move the linkages further out on the control horn.

In so doing you gain better holding power, less current usage, and less chance of stripping a servo gear.

There are articles about this here and many of the magazines that go into this in detail.

I believe FlyRC had an article about servos in their last issue where they also went into this.