Ok...... but I still don't know where you can get any of those servos from. On the speedmerchent, what are the different ways the instructions say you can mount it? Does it tell you how to drill holes or tell you how to use shoe goo or what? How come the geometry would be messed up if you didn't use a Kimbrough small servo saver? Do either of the cars come with a servo saver? Probably not because the size of the external gear on servos usually very a bit . One reason I don't want to use shoe goo is because if I strip out a servo gear, than I probably wouldn't have my car working again for the next race because shoe goo doesn't dry super fast. Thanks for all the help! It's all very helpful.