RC Rich

I'm ready to build the 3 servo mounts and install the servos. I noticed that this person didn't use the rubber isolators with brass islets that come with the servos. I'm assuming that he wanted a more solid installation with no flex. I've never done that before. What is the consensus about that technique ? It's hard to tell, but maybe he used the rubber on the flap servos. Also, the manual suggest a small amount of silicone adhesive between the servo and underside of hatch cover to reduce movement. What do you think about that?