Thanks for the reply Harley, concerning DavidR's question what are you using for the rudders in yours? I was going to follow BVM's recommendation with the 3421's and I have some on order. I also have 4ea 8231's that I am not using and their torque is 88oz as compared to 65oz on the 3421. They are larger and advertised as "dual wide spread" on the bearing. Again my servo 101 is not up to "de-ciphering" the difference. The big question is, if the 3421's are having failures what replacement would you suggest? I believe I saw an earlier post with the 3301 recommended for the rudders along with the elevators. Thanks in advance. Ken H