Both Mr. Hanson and Mr. Mathews gave good advice. I have found, especially on very large ailerons, mass balance is very important to take the strain off the servo gears when you make that inadvertant hard landing. I have stripped servo gears doing just that as the mass of the unbalanced ailerons overcame the strength of the gears.. This can also happen to the elevator servos if the elevator is not mass balanced and is very large.