I was wondering about that, as i have a bumpy control... Kind of annoying when each little click is about 3 steps on the controllers readout...
Just take the back off the radio and put a peace of fuel tubing over the little metal clicker, that will make your throttle/collective slide nice and smooth. Bend the tab a little with your figures if the fuel tube makes it a little to tight, you want your throttle to slide nice and free, not to tight.