The last .25 size profile I had stripped every HS 81 I could throw at it. I had to go to HS 85 MG's, then I never replaced a servo after that. Of course if your just going to putt-putt around with it, you could do the 81's, but you know your gonna try to twist it in half, so do the right thing on the front side. Going cheap/light on the servo set up is not always the right thing to do.