ORIGINAL: Ace9
OK I have another question. I am going to install a Futaba S3154 digital servo on the tail rotor. It has a slightly different case than the S3107's for which I used on the swash. The difference is the holes in which are drilled for mounting (one at each end) are small and are not open to allow the rubber grommets/brass eyelets to slide into (It doesn't come with them either) like the 3107's do. Not to mention the hole to hole center distance is slightly shorter. This leads up to my question. How are the 3107's being mounted onto the factory openings in the frame with respect to using the rubber grommets/brass eyelet bushings etc?
When I used the 3107s, I just screwed them down with the grommets/eyelets. I generally use them if the servo comes with them. The 3154, just screw it down directly. On helicopters, the vibration (if it's set up well) is less than a glow plank, which is where you really need the grommets to insulate them. If the heli has problems, though, and a lot of vibration going on, it will tear up servos quickly (I killed a 3154 with that 'way back when); remember the servos are directly connected to the stuff that vibrates in the first place
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For comparison, the microHeli boom mounts I used for the 9650 servos come with milled aluminum eyes to go in the holes where you'd put grommets, to take out compliance in the mounting.