at the moment i am using a ko pds2123 digital servo with my flash 4 transmitter. and all the time there is a noise coming from it, like a cliking noise and if you look at the arm on the servo it is moving backward and forwards slightly. has this got something to do with ko not being compatible with hitec or is it because it is digital.

also what hitec High Speed servo would you recommend, i race 1/10th touring cars.

many thanks
A Gower