RE: Electrifly Rifle
Assembly begins with the elevator servo and pushrod. While the instructions warn that it may be necessary to trim some of the mounting block to clear the servo lead, the Rifle is designed from the get-go for the Futaba S3107 servo. The '3107 case has a chamfered edge where the lead exits, allowing it to be directed straight down, straight ahead, or any angle in between. By directing the lead in the down direction, the servo popped right in.
The instructions were a little sketchy on whether or not to use the rubber isolation mounts, or "rubber baby buggy bumpers" as I call them, to mount the servos. After trying the servo fit both ways, I decided to use the isolation mounts, as they clearly held the servo more securely than bare screws.
A not-so-well-known fact about Futaba servos is, they have an odd number of splines on the output shaft. This means that the servo arm will mount at a perfect 90 degree angle one way, and slightly off-kilter the other way. If you discover that the servo arm isn't perfectly perpendicular to the case, take the arm off, rotate 180 degrees, and reinstall. Odds are the arm will be perfectly square to the case.
This is the technique I used to determine which arms to cut off the stock 4-way servo arm. There was a 50/50 chance of getting it right the first time... Guess how I fared. At least it's not a complicated assembly.
A fluorescent green addendum to the instructions greeted me when I first opened the box, instructing me to discard the stock black 1mm elevator pushrod, and use the heavier silver pushrod packed on top of the instructions. There was no black pushrod in the kit; evidently Great Planes is removing the lighter pushrod prior to shipping the kits.
While the instructions clearly show the elevator pushrod installed with the z-bend pushed through the servo arm from the underside, I found that this created binding in the pushrod tube. By installing the pushrod with the z-bend inserted through the top of the servo arm, the binding was eliminated.