Weezle, if your gas engines are vibrating excessively you should think about replacing them with ones that don't. I have been using 50cc gas engines (Brison 3.2) since 1995 and they do not vibrate any more than my .60 size engines did. I have helped guys using 200cc engines and I have never noticed any unusual amounts of vibration. Now, to be honest with you, the guys with the larger engines are financially well off so I would not be surprised if they were using expensive name brand engines. In other words, the engines were not from you know where. I have been using none metal geared servos for all my gas planes without a single gear failure and I fly for two hours every week. Since 1995, that's a lot of hours. I do admit that the gears do wear out and I replace the gears as needed. I also have had Futaba replace a feedback pot every now and then as they do get a worn spot around neutral over a long period of time. Dan.