Just installed a Hitec 5645 on the rudder of my Cap and have two more of these servos (both for the elevator)in the mail to me as I type. I want to up-grade my servos, currently using JR ST125mg. The new hitec 5645 has some play when I hold the case and pull the sevo arm back and forth.....about 32th to 16th of an inch, is this normal? Thanks