I have to agree unless we're just misunderstanding. I had my savage out the other day and thought the servo had gone bad. Of couse I was jumping to conclusions. Turned out to be a stripped horn. Luckilly I had one.
Fuzzy tell me what servo you have and pm me your addy. i have tons of those arms.
Look in your Savage manual and tell me what spline count you need. They list the spline counts for each brand of servo.
You may need to install a little bigger screw, the threads are probably stripped.