RE: rubber grommets on servo casing
Yup, pinnedup, you're on the right track now. Install the metal eyelets with the flange to the wood rail. The servo screw has a flange on it to protect the top of the grommet. Tighten the screw until the grommet just starts to compress, then about 1/4 turn more. If it's tightened all the way, there's no vibration protection.
Dr.1